You have two moving parts. First, the k-1 from the LLC you partly own is entered. Second, you have a 1099-NEC for contract work. It does not matter that it comes from the partnership. This income has not had Medicare and Social Security tax paid. The only way to pay those taxes is to enter the NEC as a business on Sch C to flow through to create the SE tax needed. You will indicate that this is a business so the SE tax can be generated and paid. Officially, you have a partnership with your brother and your own business.
See Am I considered self-employed?
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