We both had children at roughly the same time, but unfortunately her marriage broke up before he was a year old. Since then it seems that her parents (my in-laws) have him nearly all the time! My SIL and her ex alternate weekends, but nearly every weekend my SIL is supposed to have him she's got something else on that she can't possibly miss and dumps him on her parents. Same with school holidays. It seems so ridiculous and means that every time we need our son looked after (which frankly isn't often), they've already got my nephew! I think they spend more time with him than his mother! AIBU to think that she should spend a bit more time with her son and a bit less time going out?
Have bitten my tongue so hard today that I had to vent somewhere!