Shanks is Luffy's dad, uncle, and brother somehow.
Monkey D. Luffy is the captain of the Straw Hat Pirates, and dreamt of being a pirate since childhood from the influence of his idol and mentor Red-Haired Shanks.
Silvers Rayleigh is Luffy's uncle.
Let's be honest, Shanks was never a father figure for Luffy. He was his idol. If you want it familial, elder brother would be more appropriate than father.
Dragon and Gol D. Roger are brothers.
Shanks is actually a deep undercover government agent. When he had the fruit, he was taking it back to the government before Luffy ate it. He didn't kill Luffy immediately because he liked him or some other anime reason, but at the end of the anime he gets betrayed.
Shanks stole the Gomu Gomu no Mi from a government ship, according to the revelation in episode 1040 of the anime and chapter 1017 of the manga.
Dean Bodger is one of the few father figures in Garp's early life. We learn this in the aftermath of Garp's rooftop accident. Bodger lectures Garp, telling him to never "ever disappoint your mother" (2.92).
Usopp remains to be the weakest member of the Straw Hat Pirates. In Wano, the vast majority of the members of the Straw Hat crew received good power-ups. However, Usopp was one of the members who did not receive any power-up and thus is lagging behind.
Luffy is the protagonist of the anime/manga series One Piece and the love interest of the pirate Empress Boa Hancock.
Monkey D Mikasa is the older sister of Monkey D Luffy. She is helping her brother to achieve his dream (to become the king of the Pirates), to find a crew and so on.
Shanks' scar caused by Blackbeard because he's mistaking the gomu no mi with yami no mi which Blackbeard been searching for decades.
Shanks is the adoptive father of Uta and she formerly served in his crew as a musician.
In doing so, Luffy also awakened his Devil Fruit. It was revealed to the fans that the Devil Fruit's true name wasn't the Gomu Gomu no Mi, but the Hito Hito no Mi, Model: Nika, and it is hugely important to the overarching plot of the series.
Zoro would receive Kaido's powerful Mythical Zoan Fish Fish Fruit, which enables its user to turn into a dragon and Sanji would receive the Swim Swim Fruit, which enables its user to swim through solid surfaces like the ground.
And then later on he ate the two fruits and cuz of his sleeping disorder the two devils wouldn't fight each other.
The fruit was a treasure sought by the World Government for over 800 years, until it was stolen by Shanks and his crew in recent history. It was then accidentally eaten twelve years ago by the series' protagonist, Monkey D. Luffy.
He sacrificed his arm because a sea monster was going to eat luffy. Then it was scared of him, so it slunk back into the sea like a coward.
Bucking, Weevil is the biological son of the late Whitebeard which would make him a massive threat to anyone in the One Piece world, especially those of the World Government.
Dragon also appears to be incredibly proud of his son because of all the trouble Luffy has been causing for the World Government. He also had no problem in confirming his connection to his subordinates after his and Luffy's relationship was revealed to the entire world.
Roger's first and perhaps his most formidable rival and greatest enemy was Rocks D. Xebec, the captain of the legendary Rocks Pirates who sought to become the king of the world.