I'd wait to buy a bike until you have a really good idea of everything you'll want in it. Trying out your daughter's and husband's bikes will give you an idea of what you like and don't like in a bike, so you don't end up trading your brand-new bike in 6 months later for something you like better. Also you'll find you may have other uses you want to put your bike to (I use the same bike for 200-mile charity rides and for my 13-mile each way commute) that you can't guess right at the outset, but which would seriously influence your choice of bikes.

When you're riding, I suggest that you pay special attention to gearing, as well as feel of the ride and handling, since that's something that is a hassle, at best, to change once you've bought a bike (It'll be expensive to switch from a double to a triple after the fact, for example).