Need advice about envious, spiteful, toxic in-laws?

Don't let them bother you. It's of no importance if they want to gossip or be mean. I don’t see why you think it’s a big deal that his sister didn’t call, especially if you don’t like her anyway? Don’t you think it is possible she just forgot to call? My sister often forgets my birthday, it doesn’t bother me, and it shouldn't bother you! If they are so toxic, you should cut them out of your lives, why do you feel you can’t do that? You have your own family - you, your husband and your child -This is the only family that should concern you. Why do you still seek their support, acceptance or approval? Why are you jealous SIL gets more attention? I don’t know your in laws, but “envious, spiteful, and toxic” are all words I would use to describe your question ... so be carefull you don't become like them. You are grownups, move on with your own lives and stop overreacting about petty things and worrying what they think of you - just be happy your not like them.