You can list whomever you want on your family list. BUT you can not link your page to two significant other
I can not list both Butch and Murf as my husband you can not list a husband and a boyfriend at the same time either.
I have tried...
40 yo straight female
Married in the eyes of the government to Butch since 2001...
Murf my monogamous second husband has been with me since May of 2012.
In a V relationship with an average 50/50 split of time between my two husbands.