Companion Care Needed For My Father In Melbourne

About who needs care: My dad is in the moderate/middle stage of dementia. He lives in a house with his wife, who is a recovering alcoholic struggling with accepting his condition. Currently, he does not need assistance bathing (though he needs prompting), using the restroom or getting around. While he is aware that he is no longer at 100% cognitively, he wouldn't acknowledge or remember that he has dementia and would likely not be pleased knowing that someone has been hired to care for him. However, he gets confused with where he is, who people are, struggles to use a phone, etc. He has been to a memory clinic, and they have advised that he should not be left alone. We're looking for someone to fill in the gaps when my mom (his wife) is not there and I (one of three daughters, the only who lives locally) or other friends cannot be there. Assistance with some home care tasks would be helpful, but the primary purpose would be to make sure he is safe, knows he's not alone, answer questions when he gets confused, etc. Would probably be for a few hours at a time, a few days a week. About the care needs: Someone who is friendly but not overly talkative. Probably female. Will likely need to say she is there to help with the home care, not necessarily to "care" for him. Preferably someone who is experienced caring for people with memory loss. Services needed include: meal preparation, errands / shopping, light housekeeping, and companionship.