"However, the wife of the joint partnership owns a business. The 1999's are from income she earned from several customers. I Usually use the schedule C"

You can use more words to describe all of this. There's plenty of room in the Reply box. Example:

The husband has a W-2 from his employer. That goes on the 1040.

The wife has her own business. Even though some of the customers fall under the 1099-NEC reporting requirement, there is an entire business to enter data for. That's why you use the Sched C. It's not just those forms. it's her entire operation that you enter the data for, on the Sched C.

And did the husband and wife make an LLC to have a different business, yet? A 1065 is used for a multi-member partnership. Is there some sort of business being done by that partnership?

In other words, are the three different things going on?