London: Hollywood star James Franco's father Doug has passed away at the age 63.

Franco's mother Betsy confirmed the news on Twitter on Tuesday. The cause of death is not yet known, reports said.

"It is true that my sweet, generous husband passed away. He gave so much to his three sons and me, and to many other people, too."

Doug, who died last week, was father to James, 33, and his two brothers, actor Dave, 26, and artist Tom, 31.

He had a Harvard MBA and was a Silicon Valley Entrepreneur.