partnership is the relationship existing between two or more persons who join to carry on a trade or business. Each person contributes money, property, labor or skill, and expects to share in the profits and losses of the business.
A partnership must file an annual information return to report the income, deductions, gains, losses, etc., from its operations, but it does not pay income tax. Instead, it "passes through" any profits or losses to its partners. Each partner includes his or her share of the partnership's income or loss on his or her tax return.
You may see more details in the IRS publication 541 - http://www.irs.gov/pub/irs-pdf/p541.pdf
As you are receiving an income reported on your SSN , but that income actually belongs to another person - you receive that income as a nominee.
Please see here how to report the income in such situations depending on different types of income - http://www.traderstatus.com/nominee.htm
Please provide that information to your tax preparer for considerations.
Let me know if you need any help.