no it his uncle
luffys dad is monkey d. dragon. he might be his uncle.
Strong points that they may be related:
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We don't actually know. Oda didn't tell us, it was just presumed that Ace already knew.
The cast of Colic - 2001 includes: Roger Maunder as Dad
honestly, that's not been answered yet. we know Ace is his brother, Garp's his grandad, and Dragons' his dad. If you thought of this question with the appearance of Hancock, she's definitely not his mom-- she's in love with Luffy, so that would be just weird if she were his mom.
Parkers Transport dissolved in the early 90's due to Roger Parkers death, My dad.
Her name was Portgas D. Rouge. Little is known about her, apart from the fact she carried Ace in her womb for almost 2 years. She did this because the navy suspected a woman in her village may be carrying the child of the pirate king, Gol D. Roger. That woman was Rouge, but by keeping Ace inside her long past her due date, the navy was fooled and left. Sadly though, the effort had taken a heavy toll on her, and she died soon after Ace was born. Wanting to honour his mother for her sacrifice, and feeling no attachment to his real father, Ace took the name of Portgas D. Ace.