I get lots of weird stuff from my family. My mom thinks there has to be some "cure" for autism and drives me nuts suggesting this book or a story she heard. I get so tired of her saying about every behavior "can't they do something to teach him not to do that?" (I just want to say "yes, they can, but I would rather they not because we love to live with all this chaos and have you think I am a terrible mother!) She lives 7 hours away and babysits rarely. She did spend a day with him when he was 3 and was convinced that SHE could potty train him. For whatever reason she ended up at work with him and had her co-workers, also convinced that they knew more than me, trying to train him

How dare she "expose" him to all those people! Of course, she was unable to potty train him. She gets mad because we don't drive home to visit more than a couple times a year. I have told her that DS starts screaming after 3 hours in the car and won't stop and needs to go to the bathroom every 1/2 hour. She lays a tremendous guilt trip on me. One Christmas she kept calling me crying on the phone. It just ruined Christmas for everyone. Mom doesn't understand DS's need for routine. She thinks I am just placating him. She stayed with me when I had surgery. She fixed DS salad one night. His salad has to be in a certain order and he always has Ranch dressing. She couldn't find the Ranch, so told him he could use something else. OMG. The meltdown of all meltdowns. For two months after he asked everyday if we had Ranch dressing and had to check. Finally, I bought five bottles, so he could see we wouldn't run out.
For my IL's...they are crazy...

They couldn't stand for him to get the dx. Not because of any reason except that they want to be the ones with the most and worst medical conditions! They minimize his disability, say things like "well, its a good thing he just has autism and not this or this or this like I do". It sad and then funny at the same time. NO WAY would I ever let them babysit. MIL sends me any article she reads about someone "curing" autism. I have told her over and over and over that I don't believe that autism can be cured. I do believe that individuals can live more comfortably through a variety of therapies, but they haven't been cured. IMO, anyone who has been truly cured, likely was misdiagnosed--JMHO. She doesn't respect that though and continues to send me info. about every quack treatment she reads of. The last one she sent me had something to do with a special mud.

I just read the title and threw it away. I think these articles do acknowledge that she believes he has a legit dx, but suddenly FIL has many mysterious illnesses that no one can explain...

It's not just me that sees this either.
Whew! That felt good to vent!
Anyway, what I do now, is what I feel is best and disregard what the rest of the family tries to force me to do. I visit my folks when I can and tell them that they are welcome here. I throw away stupid articles that MIL sends w/o reading them. I just put DS's needs first (I try hard to let older DS do separate things) and tell them all that THEY can conform easier than he can. I don't really care if they like it or not. I'm not going to feel guilty about it anymore. To the OP, I don't know what I would do if it was my sis getting married, but I rarely go to weddings that are far drives, which most are, since we don't live in our home town. I know relatives get annoyed. I can't get a sitter for that long. I just tell them "sorry, I can't manage it, I wish I could come, but I can't". A couple of times, DH or I have gone separately. We just send a nice gift.
I am VERY fortunate in that my wonderful, generous, supportive sis helps in anyway she can. She isn't married, yet. She has
moved twice to live near us and help me! She is the only person in the world I know I can really count on. She knows when I really need a break and will babysit for an evening. If I ever have an emergency, she is there immediately. If DH is away for a few days, she stops by for a day, just to break up the chaos and lend a hand. She never judges me. She tells me all the time that I am a great mom and that she admires me. She is my rock. I wish every mother of a special needs child had someone like her.