Iowa law seems to allow same sex family members to marry
Maryland law seems to allow male family members to marry
Wisconsin and several other states allow first cousins to marry if:
1. They have reached a certain age where procreation would be unlikely, or
2. They can prove infertility.
Now, it would be an undo burdon to make same sex cousins wait or prove infertility (duh) so it would appear they are free to do so at will.
.
An undue burden according to who?
Any state that believes that siblings should not marry, can of course change their laws to prevent same sex siblings from marrying if their current language is not gender blind. IF states choose not to do so- well apparently the states don't care.
Meanwhile- siblings are prevented marrying regardless of fertility in every state in the United States.
But First Cousins in many states are allowed to marry only if they can establish that they cannot procreate together.
Clearly procreation is not the basis for denying siblings from marrying.
And never was.
And Obergefel doesn't change any of that.
Either States had a valid reason before- and still do- or they didn't have a valid reason before- and still don't.
Meanwhile- you can go demand your day in court- for 'justice'