If Mum has dementia, she will get to the stage where you do not want her to be able to open the front door from the inside, or she will let herself out and wander off and get lost. I went through all this when caring for 'er indoors when she had young-onset Alzheimers/dementia. Even though I was home with her all the time, still had to keep the front door and side gates deadlocked so she could not wander off. And it comes on kind of unexpectedly. After the first time you can't find her and go searching the neighbourhood only to find her fallen over in a disoriented, bloody, crying heap at the local shopping centre a mile away, you have no qualms at all about keeping that door locked to her.
The other thing is she could let some little toerags in who come knocking on the door and tell her some likely story.
So you might look for a deadbolt lock that has key inside and outside and can hold both keys at once. Then you can leave the key inside while she is still well enough to open the front door without wandering off etc. Then when she reaches that stage, you take the inside key away and she is secured inside. But by then she really should have a carer there most of the time.
All the best with your caring for her. It's a hard row to hoe so make full use of those carers etc. And get some advice on how to deal with it all. Stuff like this will be coming up all the time and often fast. Start thinking now about handrails in bathrooms and easy walk in shower stalls etc. The carer organisations and companies should be able to advise as they do this stuff all the time. There are also dementia support groups and organisations that can be tremendously helpful if you contact them. I don't know of UK contacts but should be easy to find online.
Edited By Hopper on 22/02/2022 11:09:18
Edited By Hopper on 22/02/2022 11:15:59