So yesterday we went to dhs family party and dd (12 weeks) is obviously being passed around which is fine. However at one point I had left dd with mil while I checked on ds (3.5) in another room. When I returned, dn (10) is saying "watch this", and blowing in dds face while mil holds her. Apparently after initial reflex she would laugh and they had been taking photos. I just didn't like this, especially when the 10-15 times it was then repeated in front of me (I was sat across the room), she was startled with arms way out wide but certainly not laughing or smiling afterwards. I think mil got the message when I sat watching and eventually told her to stop but why do I not feel able to say "excuse me, please stop that". It felt like teasing, how would she have liked it if I had blown in her face that many times? Had I been on my own with dn, I would have stopped her but why can I not speak up in front of mil? She is reasonable woman but I didn't expect her to think that was ok. I know it's not the end of the world and she wasn't being harmed but it was horrible feeling powerless. Any ideas of anything gentle I can say to put a stop to this kind of thing when it happens again? Btw when I've spoken up on behalf of my ds (when being teased or wound up by fil), I've received a petty "ooh, I can't play with you now because mummy will tell me off". I'm really not precious about my children in a bad way, I just don't know why I can't speak up when I feel they need defending. (I would feel able to if it was my own family ).