Companion Care Needed

About who needs care: My father has mid-stage Alzheimers/Dementia. He can perform most tasks, brush teeth, eat, use the restroom, etc, and is friendly/calm/amicable most of the time. He often has trouble communicating and getting words out when he is flustered. He needs a calm environment and stability. About the care needs: We are looking for someone to keep him company, listen to him, go for walks with him and keep him occupied so my mother can get out of the house and not worry about him while she is gone. Mainly worried about him forgetting where she went, or possibly falling when no one is home.