QoM - sorry to barge in uninvited (and please ignore me if you want - I won't take any offence).
DT (and several other respected ABers) have loads of practical/personal experience of coping with the impact that dementia has on the people close to the person with the illness.
I don't have that experience, but I worked for many years for the Alzheimers Society and my local County Council as an trainer/expert in dementia information and care. If I can help in any way I will - particularly if you have specific questions about the illness - extra knowledge can sometimes be very useful in addressing the emotional issues surrounding dementia.
Cheers
dave xx
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