A) According to Social Security Administration on: WHAT HAPPENS TO MY SSI BENEFITS IF I GO INTO A NURSING HOME OR HOSPITAL?
Generally, if you enter a nursing home or hospital (or other medical facility) where Medicaid pays for more than half of the cost of your care, your Supplemental Security Income (SSI) benefit is limited to $30 a month. Some States supplement this $30 benefit. We may lower the $30 benefit by any income you may have.
If you are age 18 or over and live in a public medical facility where Medicaid is not paying for more than half of the cost of your care, you are not eligible for any SSI benefit.
Generally, if a child under age 18 enters a nursing home, hospital or other medical facility where Medicaid or private health insurance, either alone or a combination pays for more than half of the cost of care, the child’s SSI benefit is limited to $30 a month (plus any supplementary State payment). We may reduce the SSI benefit by any income the child may have.
If a child under age 18 lives in a public facility where neither Medicaid nor private health insurance, either alone or in combination, is paying for more than half of the cost of care, the child is not be eligible for any SSI benefit. http://www.socialsecurity.gov/ssi/spotlights/spot-temp-institution.htm