Yes, I realize that when push-comes-to-shove, the in-laws will stick with W. While I have seen and observed some families that hold truth, integrity and personal responsibility above blood ties, those values are extremely rare in an age where anything goes. Today most families would side with a relative, even were they as bad as Al Capone or Grigori Rasputin, And especially given the jaundiced eye people tend to have regarding D today, who could blame them for accepting the WAS blood-relative over the trangressed?
Prodigals are a rarity today simply because there is no offense that is even recognized by either party, the lost one and their kin, let alone one needing forgiving. Why not act like a uncivilized, licentious boor? Your family doesn't care either way, right?
So, I can't blame my SIL's family -- and since the precedent has been a long time ago with MIL's multiple M's and D's, I shouldn't be too surprised either. Still I can't say that I am not disappointed... for my sake and for my S's sake.