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Goku is a full saiyan but Gohan, Goten, Trunks, are Half Saiyans
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.
Well I don't really know how goku got exposed but Trunks (A boy from the future) warns goku about the virus so Trunks gives Goku medicine wich goku uses in the middle of his virus. Goku, while fighting android 19, starts enduring the symptoms of the virus wich weekens Goku and gives 19 an oppurtunity to end Goku if it wasn't for Vegeta.
No, Trunks in any of his forms cannot beat SSJ3 Goku.
Trunks is not in any way related to Goku, other than the fact that they both have Saiyan blood, but no family relation.
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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
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.