Dementia has been slowly stealing Ruth Perez's memory and thinking ability for 20 years.
"She would put food together that didn't belong together--hamburger and fish in a pot--mom never cooked like that," said Angela Bobo, Perez's daughter.
The mother and daughter live together in Chester, Pennsylvania, just outside of Philadelphia.
Perez is the center of the family, and spends much of her day tucked under a fleece blanket—on a barcalounger in the middle of the living room. The 86 year old doesn't seem to notice as her daughter and grown grandchildren come and go, but they keep up a steady one-sided conversation with her anyway.