ooh I really like this take, she does said that the drugs is Uncle Joe's business and she only taken care of it while he is in jail. That may explain some things, even Helen accident and why she thought in calling William, to all effects, a outsider to help her.
Regarding main source of income I am far more curius of Dylan. Joes is a criminal, Scarllet works at the hospital but I think her jobs is more administrative, Helen seems to have been a housewife all her life. The Zanes seems relatively wealth, it cant all be Leia, and if Dylan was a part of Joes Mc ehy was not he who stepped up to take care of things ?