Teaching timetable conflict
I don't think you can ask to move the start of your lab section. As in the other related question about class times, those times are fixed by the university and not really movable without lots of notice. Your best bet is to get together (physically or virtually) with the other section teachers and find someone willing to switch with you. Then you can propose it to the lab organizer. 

Outside your university, you might see if there's a friend or neighbor you trust who can drop your kid at school or a way to arrange with the school to drop your child half an hour early. It can't hurt to ask them.