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Part "three's company," part "modern family," and a whole lot of "melrose place." >> whole lot of messed up. at first, the family sounds normal. mom, dad, and a child. then add mom's lover. ooh, sorry, honey. the equation you get? a hot mess. or do you? abc's abbie boudreau has more. go take care of the baby. >> reporter: really these days a modern family just like abc's hit comedy can be anything you make it. ♪ and for gida and john, their expanding modern family may take some explaining. they're polyamorous. of course, you have heard of polygamy where one man marries multiple women like in...

>> reporter: in the world of polyamory, where the more the merrier, all of them are free to date outside the household. polyamory is a growing phenomenon. researchers say there are roughly a half million polyamorous households in the united states. experts say being poly is not for most people. >> the primary issue for these polyamorous relationships is jealousy. jealousy and possessiveness. that's very human nature and hard to fight. >> reporter: a modern family in truly modern times. abbie boudreau, abc news, los angeles. >> fascinating. >> know what polyamory means, many, poly, amory, love....