Can I somehow claim my adult daughter who moved in with us? She takes care of my husband who is terminally ill.

[coupleofoldpeopl]

She is not married, she was not employed the entire 2021 year.  She cared for her father only.

[DoninGA]

Yes, you can claim her as your dependent under the Qualifying Relative rules if she meets all the requirements.

To be a Qualifying Relative -

1. The person cannot be your qualifying child or the qualifying child of any other taxpayer. A child is not the qualifying child of any other taxpayer if the child's parent (or any other person for whom the child is defined as a qualifying child) is not required to file an income tax return or files an income tax return only to get a refund on income tax withheld.
2. The person either (a) must be related to you or (b) must live with you all year as a member of your household.
3. The person's gross income for the year must be less than $4,300 (social security does not count) in 2021
4. You must provide more than half of the person's total support for the year.
5. The person must be a U.S. citizen or a U.S., Canada, or Mexico resident for some part of the year.
6. The person must not file a joint return with their spouse.

[xmasbaby0]

If she had less than $4300 of income -- not counting Social Security---and you provided over half of her support then she can be claimed as a qualifying relative dependent on your tax return.   You will get the $500 credit for other dependent and the $1400 stimulus for claiming her.

CREDIT FOR OTHER DEPENDENTS

https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...