Tokka
How do you people feel about Tokka? Do you think it could've happened somehow? Do you thik it didn't?
This is my theroy:
Toph had Lin with another man, then he died or dicided to not be in Lin and Toph's life. Then when they where living by themselves, Sokka heard about the man who left/died that was Toph's old husband, and dicided he wanted to help raise Lin and he grew feelings for Toph and they married making Sokka Lin's STEPfather. So Lin and Tenzin are not cousin's, only by marrige so they're technicly not blood cousins, so it wouldn't be a problem.
Wright what you think!!! :)