If there were to be a reboot (example, say) this next fall Wyatt would be 12, Chris would be 10, Melinda would be 7, P.J. would be 8, Parker would be 6, Penelope would be 2, Tamora & Kat would be 7 and Henry Jr. would be 6.
So... if a little magic happens, the kids age ten years (but the adults don't) then we would have a great age range of the kids from 12 to 22.