My SD had a boy about 3 years ago, we were going to have him regularly so i bought a decent car seat - which she started borrowing after she got a car and i never got it back, don't even think she still has it. Roll on 3 years, another baby boy for which she has a new car seat, but now wants to borrow the seat I bought for the older one for in my car. AIBU to be pissed off DH said sure and just had a go at me for saying make sure I get it back.