A2 Movement offers Parkour lessons for children age 5-13:
http://www.a2movements.com/#!kids-parkour-training/c19z0
And Gymkraft offers this for children between 7 and 12 years old:
http://www.gymkraft.com/fitness-class/kids-parkour/
Superfly Monkey Dragons. Contact Derrick the founder 85115510