It depends?...
On how you define things -
There is my household...there are three of us.
There is my "core" poly family - 5 of us in 2 households.
Then there is the whole "network" - which contains 7 to ?? depending on who you chose to include.
I tried to diagram it - but it just gets more and more complicated:
Just from my personal perspective (I'm the purple dot)...I have:
1.) a husband (MrS)- who lives with me
2.) a boyfriend (Dude)- who lives with me
3.) a girlfriend (Lotus)- who lives with her husband
4.) a FB (TT) - who lives with his wife
5.) 2 FWB (VV and MsJ) - who live with their primary partners
6.) a "not-quite- FWB/not-quite-platonic-boytoy" (MrClean) - who dates others (usually one at a time) and has an ex-wife that he shares custody with..lives by himself, unless he has the kids
7.) a platonic girlfriend (Angel) - who is straight but loves me anyway and claims she has as much of a right to be included in my poly tangle as any of the "newcomers"

...lives with her husband
8.) ....and then (not in the diagram) I have flirty friends that I have had sexy times with in the past and would again in the future if the opportunity arose...which it may or may not....I also have crushes and flirtations

9.) some of these people have other relationships with others in the "tangle" and/or with others - how far out do you go?
I don't really draw a line between who is "in" the network and who loves me in what ways (sex seems such an arbitrary dividing line - especially as I am not one that requires an emotional connection to enjoy sexy times)...so I have a lot of grey areas...
PS. For those of you that think this looks complicated...keep in mind that I am an introvert that actually doesn't HAVE a whole lot of friends that
aren't included in my poly tangle...I don't have "casual" friendships.