Sources of income for the Twixie family:
>various trusts and real estate steams of passive income that Twilight set up when she was an alicorn - 59%
>Twilight's Librarian salary and ""scholarships"" (Celestia is aware of this scam but let's it slide for Twilight) - 20%
>Cash that Mary gets from somewhere to pay monthly rent (no one asked her for rent money, she just started doing it) - 11%
>Selling off random magical artifacts they all find - 9%
>Trixie being a farmhand - 1%