If you are using a GraphLinksModel, which is what the Genogram sample does, you need a function that creates link data based on the relationships outlined in your node data. The setupMarriages and setupParents functions in that sample are examples of this. If you want to be able to specify the relationship on either side of it, you’ll need to adapt your code to do so.
There shouldn’t be a limit on the number of relationships in a GraphLinksModel, so you should be able to specify any number, but you’ll need to process them correctly to turn them into links.