Cheech,
Depends on what they're interested in.
Unfortunately, it has finally decided to get cold the next week, so you'll likely be inside.
There is a combat air museum in Topeka which older kids might enjoy (who doesn't like old planes???)
There's also a discovery center that I've heard about, but I don't know much about it.
There is a really good science city in Kansas City at Union Station and there are usually other activities around Union Station this time of year.
There's also a place called Wonderscope that I've heard good comments about but don't know much about
If you are willing to drive a couple hours, Squaw Creek National Wildlife refuge is holding a ton of birds right now (it may change as there is a cold spell coming in the next 10 days with a low of 12 on Saturday night) They don't have the 2 million snow geese that they typically hold in early spring, but they do have about 130K ducks right now.
Sorry I don't know more, I've been buried in work since moving to Manhattan and haven't explored Topeka that well.
I hope everything goes well for your father in law.
Scott
