my ds is 10 mo and all the rellies are coming over the next few days in preparation for his christening. this includes my aunt who i have a few issues with - it's a long story, nothing bad, but i don't trust her with my son as she is basically a bit like a 2 year old in an adult's body when it comes to acting responsibly. anyhoo, my mum is taking ds for the afternoon on saturday while dh and i prepare the house for the party on sunday. aunty x will now be with her and they want to take him out in the car, with the seat, which neither of them know how to use. i am not happy to do this, but how do i tell them without tantrums as my mum basically thinks the sun shines out aunties arse. i will not be letting them take him in the car but would like to prevent it without causing major offence. any suggestions welcome, particularly from those with experience in diplomacy!