I wouldn’t recommend Hetchell for kids, as it’s really just one buttress with a steep slope at the bottom. The surrounding woods are good for a wonder round though.
Spofforth is great for kids - safe for a 1 and a 4 year old, with plenty to explore. The climbing is ‘niche’ though. If quality climbing, rather than entertaining the family, is the priority then Almscliffe or Caley are a better bet, you’ll however need to be quite on-it to keep young kids safe.