Re: I claimed a sibling who resided in my home for 9 months of 2019. My father resides in a separate home and receives SSI for this sibling. Were we permitted to claim him?

I claimed a sibling who resided in my home for 9 months of 2019. My father resides in a separate home and receives SSI for this sibling. Were we permitted to claim him?

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Usually, only one taxpayer can claim a person as a dependent.

A taxpayer is able to claim a person as a dependent if the person meets the IRS definition of a "Qualified Child" or a "Qualified Relative."

Refer to Publication 501 (2019), Dependents, Standard Deduction, and Filing Information
https://www.irs.gov/publications/p501#en_US_2019

This publication has detailed definitions and examples.
First determine if the person is a "Qualified Child." Since this is a sibling, for you they are not a "Qualifying Child."
Then determine if they are a "Qualified Relative."

If your sibling is a "Qualified Relative" for you, I suggest that you talk with your father to ensure that only one of you claim your sibling as a dependent. If you or your father has already filed, and incorrectly claimed this person as a dependent, they should file a Amended Return to correct the error.