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.
only goku vegeta trunks and goten can fuse.
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.
Trunks reveals the identity of his parents, Vegeta and Bulma, to Goku during the "Android Saga" in "Dragon Ball Z." This occurs when Trunks travels back in time to warn Goku about the impending threat of the Androids. The revelation serves to establish Trunks' motivations and connection to the timeline, as he hopes to change the future for the better.
Goku is a full saiyan but Gohan, Goten, Trunks, are Half Saiyans
gohan,piccolo,vegeta,trunks,and goku\kakarot
Yes, Goku in Future Trunks' timeline had died of the heart virus that ravaged him.
Frieza does not get killed by Goku. Future Trunks is the one to kill Frieza.
Goku, then Gohan, then Vegeta, the Future Trunks, then Trunks, then Goten.