I'm really unsure and looking for answers as to whether IABU or not.
Had a family meal at my parents. Dbro and his GF, Dsis and her DP, DS and I. My sister is due her baby in 6 days!
On arrival we are offered drinks (its make your own from kitchen table) so we were all in the kitchen and then were heading to lounge.
DS saw a camera on the table and asked me if he could take some pictures. DS is 7yo and I know what this entails! I say not now, there's too many people and you'll get under their feet. I said maybe after dinner people wouldn't mind having 1 picture each. Obviously I also considered left to his own devices there was likely to be 100's of pics to delete!
So Mum, Sister and Brother tell me not to be so mean and to let him take photo's if he wants.............................
3 minutes later................
SISTER: for goodness sake DS stop taking everyone's photo, not everyone wants their photo taken and so you shouldn't just be taking them.
ME: 
BROTHER: DS your going to cram up the memory with loads of photo's that need deleting if you keep taking them.
ME: 
MUM: DS, your getting under everyone's feet and in their way will you stop taking photos and find something to do.
ME: 
So I unreasonably ignored DS for a few minutes and let him carry on and then asked him to get my mobile phone and distracted him with games on it.
AIBU to think that 1) they shouldn't have undermined me in the first place and 2) shouldn't have then been really snippy with DS when they realised I was right?