I believe you need to acquire the SSA-1099 form to prepare your mother's tax return. You can call the social security administration at 1-800-772-1213 to see how you can obtain a copy.
From the social security administration:
![](https://lithium-response-prod.s3.us-west-2.amazonaws.com/turbotax.response.lithium.com/RESPONSEIMAGE/0c7f864b-05c0-4b3c-afa1-a66f76610126.default.png)
I am sorry for you loss.
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