Times change. When my DH and I were courting, we went to his parents every fortnight for Sunday tea. 15 minute drive away. He came from a large family, and that was when we all met up. Several of them were married with small children, and it was an opportunity to see everybody.
Now, nearly 50 years later, with PIL long gone, we meet up once a year on anniversary of MIL’s birthday for a meal. Only time we see most of them, and if his sister didn’t organise it that too wouldn’t happen.
As for AC, DD lives in Oz, DS lives locally. Occasionally invited for a bbq, but usually ties in with wanting help with jobs. DS makes little effort to keep in touch with his sister, I know she feels she has to be the one to message etc. They all have busy lives and are quite self centred I suppose.