At God Valley, Xebec and his wife Marshall D Kirina lost there lives, they had 3 sons : Rocks D Dragon who was 17 when Xebec died and now he is 55, he got adopted by Garp at God Valley, so Luffy is the grandson of Xebec not Garp. Xebec's second son was Marahall D Teach who was 2 years old and doesn't know his parents and siblings, Teach is currently a yonko and 40 years old. The youngest was Rocks D Buggy, who was 1 years old at God Valley, he doesn't know his family too but he got adopted by Roger the pirate king and now Buggy is a yonko 39 years old.