We took our kids there a couple of years ago and managed although they're older than yours.
There's kid friendly crags around Tonsai. While we were there the kids got crook so I headed off to a wall on my own to see if I could find climbing mates. Took about 30 seconds. The wife and I took turns climbing with a group of guys happy to have us along. There's a noticeboard you can post on or hang around the climbs on the beach and you'll find a belay there.
I dunno about taking a 1.5 year old there but they can create a shite fight anywhere they go.