The ruling on eating from zakah after it has been paid or accepted as a gift, and the ruling on purchasing it

What is the ruling for one who gives his zakah to some of his relatives, but he, his children, and his wife visit them and eat and drink at their place, and perhaps the zakah is included in the food? Is there any blame on him for that?
There is no blame on him.Meaning: If you give your zakah to one who is eligible for zakah, whether a relative or not, and then he invites you or you go to him and drink from what he drinks and eat from what he eats, there is nothing wrong with it; because he owns it, and you partook of it by way of invitation or generosity or something similar. Even if we assume that he gave it to you as a gift for some occasion, there is nothing wrong with it. The prohibited thing is to buy it from him; because if you gave him your zakah and then went to buy it from him, the usual outcome is that he will lower the price for you; because you are the one who bestowed it upon him. So if he lowers the price for you, it means that some of your zakah has returned to you through this concession.