feel a bit sick. on phone, will try not to drip feed, excuse typos etc. very long story short, i gateway OK ish relationship with my dad. he's with a woman i don't see after he left my mum for her and she sent my mum abusive texts, made silent calls etc. its been 6 years but i just see dad on his own. he's seen Dd around 5 - 6 times since she was born but always texts to ask how she is. Ive recently moved back to where Im from and where he lives, he popped round last week (after i asked if he could do some paid handy man jobs for us) and he knelt down and said to Dd, would you like to come out with grampy soon? she is six around him and doesn't really know him buckle, so i was a bit 
. there's also the added complication about his partner - i wasn't invited to their wedding last year and even though Id told my dad i disliked her when it all happened, i was still surprised. mind you i wouldn't have gone. anyway, i digress. forward to today and i get a text asking if he can take her to a Bbq on Sat. to be honest Im a bit astounded. he doesn't know her well at all and wants to take her somewhere around people i don't know. it's all a bit weird. its not happening but now i feel really anxious about telling him and giving my reasons. i want to say over my dead body really but want to be nicer about it! his wife is really not nice, Im worried she's putting the pressure on about his rights to access or something? i know Ive already said this but Dd doesn't know him well at all, so AIBU? thanks for reading.