By TMZ

Former undisputed champion Evander Holyfield may think homosexuality is wrong ... but his son says the heavyweight boxer's got nothing but love for gays -- and even has a great relationship with a gay in-law.

Ewin says, "My dad is the most loving and caring person you will ever meet. He treats everyone like a human being ... even if they are homosexual."

In fact, Ewin says he has a gay uncle ... and Evander treated him like a brother.

Ewin adds, "My dad feels that being gay is a choice ... and naturally that's how things work.  You cannot procreate and make a baby with two women, or two men.  But at the same time, my dad is not going to judge someone for their sexual orientation."