Can I deduct the money I am paying to help with mom's care?

In order to claim your elderly loved one as a dependent on your taxes, you must meet certain criteria.

Any dependent must meet these tests, according to tax experts at bankrate.com:
You (the caregiver) cannot be claimed as a dependent by another taxpayer.
They must be a resident of the U.S., Canada or Mexico.
They cannot file a joint tax return with a spouse.

Read more here: Tax Tips for Caregivers: Claiming a Parent as a Dependent
https://www.agingcare.com/articles/Tax-Tips-for-Caregivers-Can-I-Claim-My-Elderly-Parent-as-a-Dependent-109238.htm

This is complicated since there are eight of you. You would be able to claim your mother as a dependent if she lives in your home and you provide at least half of her financial care. Since your mother is disabled, the $3650 annual income limit for a dependent might be waved. However, if your mother is receiving SS, you may have trouble claiming her as a dependent. I do not know of another way that you would be able to claim the money on your own income tax unless you considered it as income to your mother, and she paid the taxes and SS on it again. I hope someone will have an idea of a route you can take.

You can get much information by googling "elder dependent 1040" or something similar. It may help to give you direction about what to do.