LW2: Mom and sis violated your trust in a big way.  Not sure you can resume what you had with them.  The others sound like cowards who don't want to side against Mom.  Who knows what your mother told them.  I would report the breech so you can be sure your husband's privacy is protected; chances are this was not the only time they snooped.  Perhaps you are better off without them, until you receive an apology.