Multis? You won't be scouting out Nowra for Multis.
There's a few Multis at Point Perp but that's not why it's kid unfriendly. You could climb here with a five year old, I think I might have . Left her in the fenced off light house area with her brother while her mother and I top roped nearby.
I prefer the one next door. If you stay here they'll let you use the canoes free of charge to paddle accross to Thompsons point. The photo on their website was taken from the crag. Camp fires are permitted. It's empty that time of year...you could easily have the place to yourself.