Ruling on the grandfather showing preference to some of his grandchildren in gift giving

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He gave his infant grandson a car as a gift, but he did not give anything to his other grandchildren
His maternal aunt gave him a house then she died, and he wants to sell it

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Related Answers:
Is it permissible to allow some of his children to build on the land to the exclusion of others?
He gave her gifts to marry him; can he ask for the gifts to be returned if she refuses to marry him?
Accepting a gift with strings attached from a non-Muslim
He gave his infant grandson a car as a gift, but he did not give anything to his other grandchildren
His maternal aunt gave him a house then she died, and he wants to sell it

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