PIL are very passive-aggressive. DH and I both find them difficult - I've posted before about how DH will actually be made physically unwell by them during a visit. Part of the problem is that they are engulfing and do not allow any room for difference - they just bulldoze both of us and we have to be stand-up rude to get them to listen. We end up exhausted and upset as a result. We therefore try to limit visits to a long weekend 3-4 times a year.
I just got an email from MIL that says 'I wondered if you have any ideas what DH might like for his birthday, as we could bring it to BIL's house when we see you there next week. Sorry to ask, but as we don't see you very frequently now, I'm sure we are out of touch when it comes to presents.'
We have actually seen them more this year than in any previous year, and (as the email states) we will see them at BIL's house next week. But we couldn't make a couple of dates for a full weeken in October - because DH is madly busy with work, something they refuse to understand - and they were inflexible about other times.
I realise that this looks like nothing on the face of it, but we are trying very hard to be more assertive, but it does not come easy for us. Just posting for advice about how to respond.