You have to do it with SimPE. Greg and I have both written tutorials on the subject.
For polygamous marriages, you don't want to change the neighborhood table. Instead you change the relationships of each Sim involved in the marriage so that they're all married to each other.
I'm going to be doing this soon, because I've got twin brothers in Uni who are pretty interested in each other's girlfriends. I intend to move them all in together, marry them off in couples, then fix up the other relationships in SimPE. Will post screenshots!
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