Actor Mel Gibson's adopted gay brother Andrew Gibson has defended him against accusations he's anti-gay, the UK's The Sunday Times reported.

The 43-year-old Andrew Gibson said he decided to step forward amid allegations by Russian pianist Oksana Grigorieva that his brother is abusive. Gibson, 55, dated Grigorieva after filing for divorce from his wife of 28 years, Robyn Gibson. In 2009, Grigorieva gave birth to Gibson's daughter, Lucia. The next year, she obtained a restraining order against Gibson in which she claimed he was abusive.

Andrew Gibson called alleged taped conversations of his brother using abusive and racist language forgeries.

“When I heard them I just thought, 'That isn't Mel.' He has never said anything abusive, aggressive or racist in his life.”

He also defended his brother against claims he's anti-gay.

“He's a straight man and he was illustrating that fact,” Andrew Gibson said of comments the actor made in 1991 to Spain's largest newspaper El Pais, in which he said “They take it up the ass” when asked his opinion of homosexuals. “In the same way a gay man wouldn't want to have sex with a woman.”

“He never meant to upset anyone. I have never once heard anything anti-gay come out of his mouth.”

(Mel Gibson has since said, “I shouldn't have said it, but I was tickling a bit of vodka during that interview, and the quote came back to bite me on the ass.”)

Andrew Gibson added that his brother supported him when he came out gay more than two decades ago.

(Related: Winona Ryder recalls Mel Gibson telling an anti-gay joke.)