Sorry this is happening Kelela. If H is bringing OW around, his family has no choice but to be kind and courteous adults to her.
That doesn't mean they like you any less, but I guess in situations like this everybody if forced to accept certain things as no one can control your H's actions. Life has to take it's course and your H will learn his lesson soon enough.
Continue to be positive and work on your goals in spite of.
me: 30 H:30 tgthr:7 m:4 no kids 5 counseling sessions initiated by H as a LR: Oct 2012 long distance marriage b/c of work since Nov 2012 official BD: July 2013 nothing filed 1/1/14 I dropped the rope