Question on rank

This is made because I would like to get a general concept on how people view marriage in the thumb as I am making a thumb character who is a sottocapo married to someone outside the thumb

Would for an example

A sottocapo III marries an outsider, would the outsider be treated on the same level as the Sottocapo in question or... Still be treated as an outsider to the thumb and for context this outsider let's say, grade 2 fixer

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Please leave your answers and don't murder me