Welcome to the forum Lin - lots of people on here caring for relatives with one form of dementia or another.
My 86 year old Mum has Alzheimers (diagnosed 2 years ago now) and a host of mobility issues to add to her problems. Although Mum still manages to live independently (just !) I am virtually her sole carer and see her every day; this forum has been a lifeline for me, everyone is so friendly and supportive.