Background: I am still in touch with in-laws. MIL lives nearby. I see her about once a month. SIL lives out of state. We talk about twice a month. Relationship with MIL is pretty formal, SIL is a friendship. After the divorce I let SIL know I didn't want to talk about her brother (x) or about the D, although she knows about A.
MIL just had a milestone birthday. She is renting a summer house and inviting her children and grandchildren (not me). SIL called the other day and asked me about dates of a public event going on in my town. I confirmed the dates. SIL then tells me that X is not going to the summer house and is using his involvement in the event as his excuse. Event takes place in June, summer house dates are in July, so it is a flat out lie. She asks me why he would do that, I just tell her liars lie and she can ask him but don't expect much.
So today I get an email from x telling me about the summer house, that he is not going and the excuse (lie) he has given his mother. Then he tells me that she is going to invite me (and kids) and he wants to give me a heads up (read between the lines, he wants me to cover for his lie).
If MIL does invite me, I want to say yes. If the topic of x's lie comes up, I will not cover for him, BUT I don't want to get into a discussion about it. X's relationship with his family is his problem. I've stepped away from his craziness and have no desire to try and make sense of it to his family.
So here is the question: How do I handle this? It was easy on the phone with SIL, but I have a feeling it will be much harder when we are all thrown together in a house. Am I crazy to even consider going? Any advice is greatly appreciated.