Any gay person may marry any person of the opposite sex he or she wishes.
Otherwise we’d have no Windsors.
Exactly right,equal rights,not special rights. What do they do next, overturn legal prohibitions on incest? To what degree? First cousins; siblings; parents-children? A lot of the basis for these prohibitions is to decrease genetic in-breeding ( irrelevant? Why Old-order Amish with original breeding stock of only several thousand are rich field of study for geneticists?) Yet brother-brother would not introduce any genetics-based complications.