I would want to know what it means to date them as a couple. What if you form a strong relationship with one, but not the other -- would that be fine, or are they a package deal only? If the latter, that sort of thing very rarely seems to go well.
Good advice here: http://www.morethantwo.com/coupledating.html
The major players. Me, 30ish bi female. Gia, girlfriend of 4+ years. Clay, boyfriend/dom. Davis, ex/friend/"it's complicated." Eddie, roommate & fwb.
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. Liam, Eddie's husband.