She is already making the tractor payments, we can't expect her to buy the backhoe! I think a set of 3/8 drive, metric and inch sockets would be nice, but the big question is, does he already have it? If my dear wife bought me a set, I would ask her if she had lost her marbles, as I probably have at least 3 sets of each scattered between the house and the garage. (I used to have a job that required a set at work, along with needing a set at home)
Get somebody to inspect his toolbox and see what he needs first!
David from jax