In reply to Joint:
I spend quite a bit time in Olimpos and Cirali which is absolutely a great place.
Just do not go in high summer season. Spring and autum is the best time.
Bayram's is another good one in Olimpos. Kadir's Tree houses is usually more crowded and condensed than the others.
There will be a lot of backpackers but everybody is quite chilled and the whole valley is very peaceful.
Cirali, which is next to Olimpos sharing same beach has accommodation and restaurants and probably more family friendly as it is closer to beach and have more restaurants. If you are going in winter and early spring Cirali is also warmer in the evenings by not having the draft coming from the mountains.
Turkish people are quite family oriented and very child friendly. You will have have a great time in Olimpos or Cirali.