Not the best for a house plant, though. Grapefruit get to be very large trees, and they grow pretty fast, too.
Be prepared to prune a lot, find sunshine for it in every season and water often. If you don't have a greenhouse to grow it in, you really have no hope of fruit.
Oops, sorry to be so discouraging. I'd recommend you try a mandarin or tangerine orange for a better sized tree to keep indoors. Kumquat and Key Lime also stay smaller.
