If you materially participate in your wife's business, there is an expectation that you will be paid fair compensation for the value of the work. Your wife can hire you as a W-2 employee, or she can treat you as a 1099-NEC subcontractor for your part of the business. She can deduct wages or the cost of the subcontract as a business expense.
If you are less than your retirement age, having income earned from working may reduce your SS benefit. However, if you are at or over your "full retirement age", then working does not reduce your benefit.
https://faq.ssa.gov/en-us/Topic/article/KA-01921#!%23
I don't know what kind of penalties might apply to your wife if you work for her business and she does not properly compensate you. (It also may depend on the type of business. The rules for family members working for a sole proprietorship may be different than family members working for an S-corp. And it may depend on state law as well. And it may depend if you live in a community property state. You may want to double-check with with legal or tax professional if you perform substantial work and don't get paid.)
