If you don't want to sound like a snob, don't describe your family's house in the country as a villa. A villa is a fancy vacation home.
Calling your weekend country house a villa will inevitably sound like you're showing off. Still, the word has been around ever since ancient Roman times to mean "country house for the elite." In Italian, villa means "country house or farm." Most villas include a large amount of land and often barns, garages, or other outbuildings as well.