I am my father's primary caregiver and I live with him and my mom. He suffered a stroke in 2016. He has vascular dementia. A caregiver comes over 5 days a week to give him a shower, etc. After the caregiver leaves, my dad becomes more demanding calling me multiple times, especially at night and in the early morning. How do I stand up to him? I feel like a slave. I have my own health issues. Any suggestions?