"Eles podem vender sua casa."

[rcrichards]

So this may be a limit on my understanding of Portuguese but "sua" refers to a feminine thing that belongs to a third person or the person you are talking to in Portuguese if using the polite form, correct? So if the context does not make it clear which house is the subject one could use the "dele" construct right?

[r_i_l_e_y]

yep, "a casa dele"