diff --git a/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/SelectVariants.java b/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/SelectVariants.java
index 17b9a57ee..b4725b81b 100755
--- a/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/SelectVariants.java
+++ b/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/SelectVariants.java
@@ -25,6 +25,7 @@
 package org.broadinstitute.sting.gatk.walkers.variantutils;
 
 import org.broad.tribble.util.variantcontext.Genotype;
+import org.broad.tribble.util.variantcontext.MendelianViolation;
 import org.broad.tribble.util.variantcontext.VariantContext;
 import org.broad.tribble.vcf.VCFConstants;
 import org.broad.tribble.vcf.VCFHeader;
@@ -40,15 +41,9 @@ import org.broadinstitute.sting.gatk.walkers.RMD;
 import org.broadinstitute.sting.gatk.walkers.Requires;
 import org.broadinstitute.sting.gatk.walkers.RodWalker;
 import org.broadinstitute.sting.utils.SampleUtils;
-import org.broadinstitute.sting.utils.text.XReadLines;
 import org.broadinstitute.sting.utils.vcf.VCFUtils;
-import org.omg.PortableInterceptor.DISCARDING;
 
 import java.util.*;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-import java.io.File;
-import java.io.FileNotFoundException;
 
 /**
  * Takes a VCF file, selects variants based on sample(s) in which it was found and/or on various annotation criteria,
@@ -75,6 +70,13 @@ public class SelectVariants extends RodWalker<Integer, Integer> {
     @Argument(fullName="discordance", shortName =  "disc", doc="Output variants that were not called from a ROD comparison track. Use -disc ROD_NAME", required=false)
     private String discordanceRodName = "";
 
+    @Argument(fullName="family", shortName="fam", doc="If provided, genotypes in will be examined for mendelian violations: this argument is a string formatted as dad+mom=child where these parameters determine which sample names are examined", required=false)
+    private String FAMILY_STRUCTURE = "";
+
+    @Argument(fullName="mendelian_violation_quality", shortName="mvq", fullName="mendelianViolationQualThreshold", doc="Minimum genotype QUAL score for each trio member required to accept a site as a violation", required=false)
+    private double MENDELIAN_VIOLATION_QUAL_THRESHOLD = 0;
+
+
     private ArrayList<String> selectNames = new ArrayList<String>();
     private List<VariantContextUtils.JexlVCMatchExp> jexls = null;
 
@@ -82,6 +84,10 @@ public class SelectVariants extends RodWalker<Integer, Integer> {
 
     private boolean DISCORDANCE_ONLY = false;
 
+    private MendelianViolation mv;
+    private boolean MENDELIAN_VIOLATIONS = false;
+
+
     /**
      * Set up the VCF writer, the sample expressions and regexs, and the JEXL matcher
      */
@@ -93,13 +99,19 @@ public class SelectVariants extends RodWalker<Integer, Integer> {
         Map<String, VCFHeader> vcfRods = VCFUtils.getVCFHeadersFromRods(getToolkit(), rodNames);
         Set<String> vcfSamples = SampleUtils.getSampleList(vcfRods, VariantContextUtils.GenotypeMergeType.REQUIRE_UNIQUE);
 
-        DISCORDANCE_ONLY = discordanceRodName.length() > 0;
         samples = SampleUtils.getSamplesFromCommandLineInput(vcfSamples, SAMPLE_EXPRESSIONS);
         for (String sample : samples) {
             logger.info("Including sample '" + sample + "'");
         }
+
+        DISCORDANCE_ONLY = discordanceRodName.length() > 0;
         if (DISCORDANCE_ONLY) logger.info("Selecting only variants discordant with the track: " + discordanceRodName);
 
+        if (!FAMILY_STRUCTURE.isEmpty()) {
+            mv = new MendelianViolation(FAMILY_STRUCTURE, MENDELIAN_VIOLATION_QUAL_THRESHOLD);
+            MENDELIAN_VIOLATIONS = true;
+        }
+
         // Initialize VCF header
         Set<VCFHeaderLine> headerLines = VCFUtils.smartMergeHeaders(vcfRods.values(), logger);
         headerLines.add(new VCFHeaderLine("source", "SelectVariants"));
@@ -145,25 +157,31 @@ public class SelectVariants extends RodWalker<Integer, Integer> {
                     }
                 }
             }
-            return 0;
         }
 
         if ( vcs == null || vcs.size() == 0) {
             return 0;
         }
 
+
         for (VariantContext vc : vcs) {
-            VariantContext sub = subsetRecord(vc, samples);
-
-            if ( (sub.isPolymorphic() || !EXCLUDE_NON_VARIANTS) && (!sub.isFiltered() || !EXCLUDE_FILTERED) ) {
-                    //System.out.printf("%s%n",sub.toString());
-                for ( VariantContextUtils.JexlVCMatchExp jexl : jexls ) {
-                    if ( !VariantContextUtils.match(sub, jexl) ) {
-                        return 0;
-                    }
+            if (MENDELIAN_VIOLATIONS) {
+                if (mv.isViolation(vc)) {
+                    vcfWriter.add(vc, ref.getBase());
                 }
+            }
 
-                vcfWriter.add(sub, ref.getBase());
+            else {
+                VariantContext sub = subsetRecord(vc, samples);
+                if ( (sub.isPolymorphic() || !EXCLUDE_NON_VARIANTS) && (!sub.isFiltered() || !EXCLUDE_FILTERED) ) {
+                        //System.out.printf("%s%n",sub.toString());
+                    for ( VariantContextUtils.JexlVCMatchExp jexl : jexls ) {
+                        if ( !VariantContextUtils.match(sub, jexl) ) {
+                            return 0;
+                        }
+                    }
+                    vcfWriter.add(sub, ref.getBase());
+                }
             }
         }
 
diff --git a/java/src/org/broadinstitute/sting/oneoffprojects/walkers/GenotypeAndValidateWalker.java b/java/src/org/broadinstitute/sting/oneoffprojects/walkers/GenotypeAndValidateWalker.java
index 16afd8912..f54c602c6 100755
--- a/java/src/org/broadinstitute/sting/oneoffprojects/walkers/GenotypeAndValidateWalker.java
+++ b/java/src/org/broadinstitute/sting/oneoffprojects/walkers/GenotypeAndValidateWalker.java
@@ -26,6 +26,7 @@
 package org.broadinstitute.sting.oneoffprojects.walkers;
 
 import com.google.common.collect.ImmutableSet;
+import org.broad.tribble.util.variantcontext.MutableVariantContext;
 import org.broad.tribble.util.variantcontext.VariantContext;
 import org.broad.tribble.vcf.VCFHeader;
 import org.broad.tribble.vcf.VCFHeaderLine;
@@ -45,6 +46,7 @@ import org.broadinstitute.sting.gatk.walkers.genotyper.VariantCallContext;
 import org.broadinstitute.sting.utils.SampleUtils;
 import org.broadinstitute.sting.utils.exceptions.UserException;
 import org.broadinstitute.sting.utils.vcf.VCFUtils;
+import sun.management.counter.Variability;
 
 import java.util.*;
 
@@ -199,7 +201,13 @@ public class GenotypeAndValidateWalker extends RodWalker<GenotypeAndValidateWalk
             else
                 counter.numFP = 1L;
         }
-        vcfWriter.add(vcComp, ref.getBase());
+        if (!vcComp.hasAttribute("callStatus")) {
+            MutableVariantContext mvc = new MutableVariantContext(vcComp);
+            mvc.putAttribute("callStatus", call.confidentlyCalled ? "confident" : "notConfident" );
+            vcfWriter.add(mvc, ref.getBase());
+        }
+        else
+            vcfWriter.add(vcComp, ref.getBase());
         return counter;
     }
 
@@ -224,7 +232,7 @@ public class GenotypeAndValidateWalker extends RodWalker<GenotypeAndValidateWalk
         logger.info("FP = " + reduceSum.numFP);
         logger.info("FN = " + reduceSum.numFN);
         logger.info("PPV = " + ((double) reduceSum.numTP /( reduceSum.numTP + reduceSum.numFP)));
-        logger.info("FPV = " + ((double) reduceSum.numTN /( reduceSum.numTN + reduceSum.numFN)));
+        logger.info("NPV = " + ((double) reduceSum.numTN /( reduceSum.numTN + reduceSum.numFN)));
         logger.info("Uncovered = " + reduceSum.numUncovered);
         logger.info("confidently called = " + reduceSum.numConfidentCalls);
         logger.info("not confidently called = " + reduceSum.numNotConfidentCalls );