A man I meet every day on the road while taking his son to kindergarten always looks at my tits, and he is also married with a son

Men are very visual creatures. Tits are designed to firstly attract attantion, then to be a pleasue in sex, then to feed babies. So he is just reacting to his biological programming. Take it as a compliment. But leave him alone. Believe me, messing with a married man (or woman in my case) only leads to problems and confusion.