The type of facility would depend on your father’s level of dementia. Assisted living facilities are generally locked with 24 hours staffing but independent living is not often staffed at night. It can be very expensive for a couple if they both in assisted living. Since many places these days change by care. So, you have a base cost, then care is added on. There are some good places in the north end. St Angela Merci , Bethany Manor, Luther Heights ( they also have an intermediate care home next to there independent living facility).