Remember, he need not major in biology to be a pre med. All he needs to do is take the prescribed coursework–as electives if necessary.
Both my daughters are physicians; neither was a bio major. In their respective med school classes, they had fellow students who majored in diverse fields including agriculture, Italian, English literature, classics, gender studies, sociology, sports communication, physics, mathematics, musical theory. They are all now attending physicians.
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And as a cautionary note. Most medical schools cost at or above $100,000/year.
(See: Med Schools Over $100K/year for OOS Students and Medical Schools w/ COA over $100K/year)
You and your child should keep this in mind also when choosing a undergrad. Pre-meds are strongly advised NOT to go into debt to pay for undergrad since they will be taking huge debt to pay for med school.