Our poly relationships have developed somewhat separately, although our living arrangements are very close. It's important to me that we're all able to get along, as it's been very nice to be able to share certain occasions, like Christmas and birthdays together. We have socialized as a group before and I have spent some time with just my husbands gf, as it's important to her that we get to know each other. My husband and bf don't seem to have that need, they haven't spent any time together without me, they do get along though.
We're a family of sorts, but we maintain more of a "friendship" with each others partners, not an intimate bond.
"There are worse crimes than burning books. One of them is not reading them." - Ray Bradbury