Yes, you can claim your granddaughter and great-grandson as dependents since you provide more than half of their support and she made less than $4,150 even though they don't live in the same home as you do. You would receive a $500 nonrefundable tax credit for each of them as they would be "Qualifying Relatives" instead of "Qualifying Children" since they did not live in the same principal household as you.
https://blog.turbotax.intuit.com/tax-deductions-and-credits-2/family/who-can-i-claim-as-a-dependent-...
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