When I put in information about my mother and father, your system automatically assumed they were married. That's a giant world of fail. I dug in and found that I could change this, but the options are way too limited.
Relationships are complicated. My parents were never married. Nor are they partners. Nor are they ex-partners. Nor does any other option on your list describe their relationship.
So provide an "other" option and let me fill it in.