How about,
"We really enjoy the opportunity to teach our own child".
To get into more detail you can say,
"The opportunity to dig deeper into particular subjects is astounding. We do botany lessons at the local Botanical Gardens. We have math & science field trips at _________(museum). He gets together regularly with xyz for organized sports. He can take music lessons when it best works in our schedule. He can get all this extra stuff, and still get to bed in time for hubby and me to have alone time! No more squeezing in all the extracurricular activities into the few hours after school."
