I work part-time - Monday, Wednesday and Friday. I look after DD Tuesday and Thursday (on my own) and we both look after her at the weekend... She goes to nursery on the other days. I have just booked a term of guitar lessons (it's for an hour on a Thursday) and I've asked if he could have her on his own after work. He says it's unfair because we have both worked that day, so he gets extra when he gets home 
AIBU?