Ryan O'Neal proudly shows off the famous Hollywood clan's latest addition – dashingly decked out in a straw hat and shades – in holiday weekend photos posted on Twitter and Facebook.
"Had a wonderful day with my new great-grandson Sidney," O'Neal, 72, writes. "Happy #MemorialDay to all!"
Sidney is the grandson of O'Neal's son Griffin O'Neal, 48, who has had well-documented troubles in his personal life and with dad Ryan.
But if great-grandpa's beaming smile is any indication, things may be looking up for the O'Neals.