I would guess (after googling fraternal twin to mean "non-identical") that they were identical, but I don't know for sure. I myself could tell them apart after a year maybe. And then around age 11 or 12 one got a cheek cut (snowshoveling mishap) that pretty much ended the identical part.
Other facts of the case - I can't remember the mother or father treating them any differently. And after high school I lost touch with them - it would be intersting to see what happened, though.
I ask because Identical Twins are formed from the same egg & sperm and have IDENTICAL DNA. Any case of a homosexual identical twin with a hetrosexual twin would discredit a "gay gene" theory.
And I used google also to make sure I had the correct word.