Can I claim an elderly man whom I've been taking care of for the past 7 mo as a dependent on my taxes?

I've been working self employed for an elderly who was diagnosed with Alzheimer's/ dementia. He is a very close friend of my family so I agreed to move in with him and become his full time caregiver. He draws a little SSI check once a mo. But It's never enough to cover his expenses. For the past 7 mo I've been having to cover half his bills. Can I claim him as a dependent on my TaX return or would I just be hurting myself and have to pay out more?