Nothing as I don't have any kids, and doubt I ever will.
I do have a dad though. Unfortunately he's swanned off down to Devon & Cornwall on holiday, and is infamous for leaving his phone off, while my mum is infamous for going on holiday and forgetting her charger, so I've no way of calling them and will have to wait until next weekend to give Dad a gift.
I haven't yet decided what to get him, as he's not an easy person to buy for. He has at least one of everything, and in many cases he has several - such as his four (!!!) lawn-mowers.