My dad is 88 and caregiver to my step mom who has Alzheimer's. He needs help, what services are available to him?

I would go with an Elder care agency. The one here I interviewed met with me in their home. I explained what we were looking for and they interviewed my in-laws. They were also very good dealing with resistance from the in-laws. Sometimes with doctor orders you can get insurance to pay for certain in-home help. I did some research online and discussed it with their doctor. Money is normally the biggest issue and why I involved the doctor.