How can I go about getting paid for caring for my brother if I am his POA?

Some states have programs where family caregivers can be paid to provide care. My understanding is that the pay tends to be low and that there are a lot of restrictions in terms of eligibility but it certainly makes sense to check into it. I would contact the Dauphin County Area Agency on Aging:

https://www.dauphincounty.gov/government/human-services/area-agency-on-aging

I also found this link for something called the Pennsylvania Caregiver Support Program:

https://www.aging.pa.gov/aging-services/caregiver-support/Pages/default.aspx

Best wishes to you.