There are several people on Eden who are in poly relationships or varying types.
"What are your thoughts on it(If you're in one or not)?":
My personal feeling is that those relationships are destined to fail UNLESS all 3 people honestly love each other. And not necessarily in a sexual way since not all poly relationships involve all 3 partners bedding each other. Love doesn't just happen when you want it to though, so I think a lot of people who jump into poly relationships are in it for the wrong reasons. Sex, usually, and if that's the case then they'd be better off exploring an open relationship with regular recreational threesomes.
"What do you think it's effects on a family are?":
If it's a solid poly relationship, then I think everyone in the family benefits from it in many ways.
"Would you be interested in it yourself and why?":
Alan & I had many discussions about this over the past year or so and are open to the idea, but are not currently in one ourselves. The reason we're open to it is because it simply wouldn't make any sense to walk away from anyone that we mutually felt we couldn't be happy living without, just to appease other peoples' ideas of what's right.