Obsidian, the OP has been picking up the cheque for the last 7 YEArS.
Reasonably how many more years of her life does she give this guy before he pulls his head out of his asse?

She has done Nothing but support him. There in lies the problem, he has forgot how to look after himself, and has lost the pride that goes with being a provider and supporter for your family.
Seesaw has it bang on, if you want to be in the arts you have to fund it first.
How many people aspire to be actors? Thousands but they have to run other jobs in the meantime.And in the end we might never even know who they were, because they can't all be famous.

I don't understand why if he loves production so much he isn't earning, to get software and a sound desk. Why he isn't out there Sampling local talent and running up free demo''s for them.
He is going to fall behind with the programs (software)etc. If he doesn't keep a hand in.

None of this is the OP's responsibility. It is never acceptable to expect another person to support you, especially if your a fully capable adult. Certainly not for the best part of a decade.

And one more thing,who'd pay for his therapist, that he needs?
Take a guess.

Anyway enough grumbling. We may just have to accept a differing of opinion on this one.