my parents were so proud of their son in law - a good man with a well-respected job. he would often bring cigars when we would go visit so he and my dad could sit out and have a puff. my mom would always ensure that he got his proper meals and special breakfasts.
they were devastated by this. my father had a very hard time, as he is not one who is overly emotional, but he felt betrayed personally and hugely saddened for me. my mother was much more verbal about the betrayal but was very civil to him. my dad would leave anytime husband would show up to pick up or drop off our son during summer and school break visits. eventually, so did my mom. it was often left to my sister, who could pretend to be pretty clueless and indifferent about stuff to hand off son to his dad (not an insult, by any means, just to say that she was perfect for this kind of exchange). things warmed during his attempted return but then went boobies up again when it was found that he never stopped seeing his ow.
my parents and my inlaws weren't super close but mil and fil did feel the need to visit my parents and apologize for their son. my parents said the embarrassment was palpable. in laws still aren't fully engaged with their son and it does really seem like efforts aren't being made on either side. ugh...
at any rate, if they are somehow forced to interact, as in drop off and pick up, you can count on my dad not being there, my mom likely not being there, depending if she can move fast enough
bad knees, and most likely my sister there with big baby blues going "huh? oh! right...here for son, aren't you?" and that about sums it up after 20 years of being family