If you provided more than half of the support of her son and partner, you can claim them as your dependents.
Concerning your partner, to qualify as your dependent, in addition to the above condition, she has to live with you all year and have gross income of less than $4,300 in 2021.
You can claim and receive the Child tax credit for your son on your 2021 tax return.
Your partner, if she files a tax return, has to report the advance child tax credit, but will not have to repay it if her Adjusted gross income is less than $75,000. But remember that her gross income has to be less than $4,300 to qualify as your dependent.
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