Trunks is not in any way related to Goku, other than the fact that they both have Saiyan blood, but no family relation.
No, Trunks in any of his forms cannot beat SSJ3 Goku.
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No, Goten is the son of Goku and Chichi, whereas Trunks is the son of Vegeta and Bulma.
Goku is a full saiyan but Gohan, Goten, Trunks, are Half Saiyans
Goku was surprised that Vegeta was the father of Trunks (and so the wife of Bulma), but he was happy for Vegeta and Bulma and didn't think it was "bad."
Goku would win any fight against Trunks, as he can transform up to SSJ3, and is much stronger regardless.
only goku vegeta trunks and goten can fuse.
gohan,piccolo,vegeta,trunks,and goku\kakarot
Frieza does not get killed by Goku. Future Trunks is the one to kill Frieza.
Yes, Goku in Future Trunks' timeline had died of the heart virus that ravaged him.
Goku, then Gohan, then Vegeta, the Future Trunks, then Trunks, then Goten.
I think that the episode trunks show when he was a baby was episode 150 - 170.they first show trunks with sword and new born baby trunks in the episode when goku finally returns from the planet namek :)