This is for California, USA
My MIL is living with us these days and we do not actually charge her for any rent. She has a small business that has sporadically yields some income. She insists on paying us with that money as my wife is paying for the mortgage on a house (separate from the one we all live in, which is owned by me) they (wife and MIL) own jointly. The amount would be between 10k to 15k a year.
How does this work in terms of taxes? Do we need to report the money MIL gave us as "rent" money?