Legal Question in Real Estate Law in Texas

He can't charge you rent, but he has as much right to occupy the house as you do. You're going to have to make some kind of deal:

sell or rent out the house and split the money

you buy him out

he buys you out

Or, he could let you stay rent-free -- but you'll have to work it out.

If you can't work it out, one of you can ask a court to partition the property, which in the case of a house and lot, probably means ordering a sale and dividing the money.