Of course they are brothers
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this is a good question and it is my hounour to answer it I think that gohan is more powerful at the ultimate level the goten but it also matters if goten is in his ultimate form Gohan is way stronger then Goten.
Goku's second son is named Goten. He is Gohan's younger brother.
In Dbz it is goten, but in the dbz movie history of future trunks its gohan cause since goku got sick goten was never born and gohan was trunks' mentor!
In his youth Goten trained with gohan, trunks,and his mother
Gohan and Goten