I live with my parents and grandfather in four people at my dad's hometown. Grandfather has advanced dementia, repeats the same things and actions over and over, mistakes mom for his deceased wife, and touches her ass and breasts, but mom takes care of him kindly and devotedly. One day, when I got home, I heard a voice from the kitchen and peeked in. Grandpa was calling grandma's name while having sex with mom, and I couldn't take my eyes off that shocking scene. It seems like their relationship has gotten even closer since that day.
