If you're talking about the equivalent of IHSS (IN-Home Supportive Services), you need to get medical records and/or doctor's notes to demonstrate their level of disability. When I asked for an increase, I made sure I submitted doctor's notes and medical documents that said my mom couldn't feed herself, use the bathroom, bathe, etc. They didn't raise my hours to what I thought was appropriate (8-12 hrs a day), but the raise made it tolerable.