DH has had a bit of a "discussion" with his parents over the weekend". We're planning a party for DD's first birthday in a couple of months time. We know she won't remember it but we're planning it as a big family and friends get together, it's instead of a christening as we're not religious and a chance for wider extended family to meet DD. DH and I are looking forward to it. We've told PILs all this and gave them the date ages ago. Now they have booked a holiday abroad over DD's birthday. Apparently they forgot. They are self employed and could have booked for any time and have been away several times this year already. DH is pretty fed up/pissed off and is reading it as "they don't care enough to remember" and has told them they're being crap. PILs have suggested we move the party to "another weekend" as they "don't want to miss out". We're busy the weekend before and after and tbh we would like the party the weekend of her birthday (as planned and as we've booked the venue for). We're going to go ahead as planned, but without them. It's a shame they'll miss it but there you go. They think we are being highly unreasonable. I think they are, but happy to hear an alternative perspective...?