0626 What to do after the house being sold out

My fiance called me yesterday.There was a man who wanted to buy my fiance's house and his price was high enough.
Our conversations were as below.
He:What should I do after selling the house?
Me:Give me 80 percent of the money you earn by selling that house.
He :I have to give my younger sister 20 percent of the money I earn because the house is under her name. If I know I have to give you so much money beforehand,I would rather not to buy the house at the beginning.
Me:Just give your sister 20 percent and give me 80 percent of the money then your dream will come true.After doing so,you will have no money left and you will feel as if you did not buy that house at all.