How to become a caregiver for my father?

Do you mean being paid? There is really no programs out there for family to get paid. Some state Medicaids may pay you or at least supply an aide a few hours a day. But, Dad needs to fit the criteria,

According to your profile, "I am caring for my father Warren, who is 100 years old, living in my home with age-related decline and alzheimer's / dementia." It sounds like you're ALREADY a caregiver to your father!

What is your question, exactly? Please expand on the header you left here and explain your situation and what you need help with, precisely.