Each of you must separately determine your eligibility for the sick and family leave credit. For you to be eligible for the credits, you would have to regularly carry on a business. Since you started the business in late 2020 and earned limited money from it that year, you would probably would not qualify in so far as regularly carrying on a business for that year is concerned.
If you just collected royalties in 2021, you would also not qualify that year, as the purpose of the credit is to pay you for time spent away from your job because of Covid.
Your spouse's income would not affect your ability to claim a credit since the credits are determined on an individual basis. I believe you said that she already received credits based on her work.
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