"Your mother is NOT the nominee because the 1099 combined docs came in her name and ssn. You and your brother are the nominees because you did not receive a combined 1099 in your names and ssns even though you do each need to claim your share on your own return."
This is backwards.
IRS Says:
Nominee/middleman returns. Generally, if you receive a Form 1099 for amounts that actually belong to another person, you are considered a nominee recipient. You must file a Form 1099 with the IRS (the same type of Form 1099 you received) for each of the other owners showing the amounts allocable to each. You must also furnish a Form 1099 to each of the other owners. File the new Form 1099 with Form 1096 with the Internal Revenue Service Center for your area. On each new Form 1099, list yourself as the “payer” and the other owner as the “recipient.” On Form 1096, list yourself as the “Filer.”
What is being suggested by @gloriah5200
is to avoid all this and just fudge TurboTax into dividing everything into thirds.
That's your call.
