I read recently, not on Mumsnet but somewhere similar, a young woman stating categorically that she would not take on responsibility for communication (such as making arrangements, sending birthday gifts, etc.) to her husband's side of the family. I was a little shocked to see in the comments that most of the respondents wholeheartedly agreed with her, even if it meant that communication with that side of the family dwindled to nothing, assuming that many men are not that bothered about keeping in touch or even remembering birthdays, etc. I'm an older woman with a daughter and a son, both married. My daughter keeps in daily contact with me but has virtually no contact with her PIL. As a result, I see a lot of her children and know what's happening in their lives. My son, on the other hand, literally only gets in touch when he wants something -usually money- and I never hear from my DIL at all. I only see their children when I visit them (self-invited); they hardly ever visit me and my DH although I've invited them lots of times ( they're always 'busy', often with DIL's side of the family) and said that they can come whenever they want to. Birthdays, mothers/fathers days and Christmas are a bit hit and miss regarding presents and cards from them, although I always visit with cards and gifts for them.
So, my query is: am I being unreasonable to expect at least some sort of regular input from them, regarding the children at least? Is it definitely a thing that young mums now refuse to take on the burden of keeping their MIL up to date and maybe sending birthday cards or whatever? It might make me feel a bit better if I know it's just my son's laziness (not that that's any excuse) rather than antipathy from my DIL.