Siblings leaving their children with us (we have kids of our own), fucking off back to bed and then not saying thank you or acknowledging anything about it.
Siblings being too lazy to get up to their 2 year old in the middle of the night and letting them roam around the holiday house full of hazards (including an indoor pool -locked but still worries me!) in the middle of the night.
Siblings not getting up in the morning and letting their kids come and wake us up.
This was way worse in past years and my mum told them off 😁
People interrupting others in the middle of talking - just thinking out loud about food shopping etc in the middle of an interesting anecdote or something
Loud eating and scraping knives across plates
Shit jokes that you can’t even tell are jokes
Completely unable to come up with a plan, then once plan is decided upon, completely inflexible if people want to splinter off it’s like a personal attack and offends is taken
must do everything together all the time (6 kids and 6 adults, unlikely to all be satisfied!)
luckily this is across 2 separate sides of the family so never all at once.