Plane for the kids

My kids have flown around in my Mooney their entire lives. Now they are
getting close to the teen years and I'm thinking of buying them a plane
and teaching them to fly in it. I've got a few years before they are
old enough but I'm starting to think about it. Some group suggestions
would be appreciated...

1) If I buy the plane just long enough for them to learn to fly can I
aviod California sales/use tax by being a dealer? How long can a dealer
hold the plane? If I only need the plane for 12 months or so, it would
be sad to have to pay 9% sales tax on the plane.
2) I'm throwing around the best plane to teach them in that would be
fun and not too expensive for dad. I'm thinking maybe a Taylorcraft or
a Lucsome. I learned in a Cessna 140 so that might be a good choice
too. I could just buy them a C150 but having something fun for dad to
fly (i.e. Aeronca, etc) would make it all the better!
3) Has anyone else on the list taught their kids to fly? I do know of
two other CFIs that have done this. The kids loved it. However, once
they finished their private life seems to prevent much other flying
until they establish in a career. I figure the boys will be pretty busy
with scouts, high school, and trying to get into a good college they
will want to earn their private and then set it aside for some years.

-Robert, CFI