Purchase contract, deed of gift
There may be a family farm within the family. The widow envisions that the children will not be able to keep the family farm themselves after she dies. She may be thinking of giving the farm as a gift to one of the children so it stays within the family. Or should the child buy the farm? The child may not be able to afford it. It may be of interest that you can give a gift with conditions.
It is very important to know the consequences of the actions before deciding how to do it. Then it is good to review a knowledgeable lawyer in the legal field before making a decision on the matter.