12:27, if everyone seemed to chow down and enjoy the food, I would keep my trap shut. I recognize that I can be over-the-top when it comes to food prep, but I think a lot of people who love to cook from scratch and hunt around for obscure ingredients understand this compulsion. I would suppress it to maintain the peace. The problem is DH brought it up and said the chicken was bad, and he didn't like it.
I like PP's suggestion of monitoring the meat--I will have to be careful, though, because he shoos me away. I'm just realizing FIL gets kind of territorial over the grill in his own way. He doesn't even seem to like you throwing on the meat yourself. He wants you to put the food on a table, and he will put on the grill in his own way. He also doesn't seem to want anyone else in the backyard when grilling either. He overcooked the apricots-and-cheese to mush.

He said he never grilled apricots before, which made my nervous, and voila! it came back mushy.
Problem is, he doesn't learn from his grilling mistakes. I would love a grill partner in crime, and we can get better over the summer, but he thinks all of it is absolutely delicious. If DH criticizes him as he's threatening to do the next time, FIL will sulk and not grill AT ALL. FIL is an oblivious bad cook. This is a FACT. DH has told a lot of stories from his childhood dinner table that would make anyone who has any rudimentary cooking skills shake their heads.