I don't often dissagree with Minnflyer but I will this one time.
You can never go wrong with a good trainer.
1.Like you said, you can teach your wife and son with it.
2.nothing better for some lazy, kicked back, flying.
3.they can make exellent float planes.
4.larger trainers, like Kadet Senior or Senior Telemaster, work well as work horses (tow plane, candy drop, aerial photography ect...)
There are a whole bunch of good reasons to have a good trainer laying around for even the most experienced flyer.