Gratuitous contract  is a contract in which one party only enjoys contractual rights without paying any price. In other words, one party to the contract gives a certain benefit to the other party, and the other party does not have to pay any price to obtain the benefit.
According to the above definition, which of the following options is not part of a gratuitous contract?
Lao Wang has no children under his knees. He gifted a set of real estate under his own name to his nephew who has been taking care of him, and signed a gift contract with the other party.