"Ellos tienen una lavadora en su casa."
Translation:They have a washing machine in their house.
Theoretically that is possible. However, why would they put their washing machine in someone else's house?
Would washer be used for washing machine? How about dishwasher?
Also I know I have seen this before but I don't recall the answer. Why use su and not sus for they?
su casa because casa is singular, and the modifier agrees with the thing modified = casa
Of course. What was I thinking? I had it in my mind we had to pluralize because it's more than one person. Good reminder
It's a washing machine. Dishwasher would be "lavaplatos" or "lavavajillas".