"Oletko nyt naimisissa?" Should be accepted too, I reckon ...
Why is the verb Olleteko and not Olletko? Where does the extra e come from?
Oletko = are you (singular)
Oletteko = are you (plural)
So "Oletko naimisissa?" means "Are you married to someone?" and "Oletteko naimisissa?" would most likely mean "Are you two married to each other?".
Shouldn't "Oletko sinä naimisissa" be correct? I mean you can totally ask someone if they are married or not
Why (te) was used in the second sentence