Shelflife, so sorry to hear this. My thoughts are with you.
My Mum died 4 years before my Dad but she was sharp as a tack in her late 80s and coped amazingly with Dad's dwindling capabilities. Unfortunately Dad had Alzheimers from a few years before she died and once she was no longer with us all it fell on my brothers, myself and my sister to do whatever we could, which involved moving him closer to us all so that we could visit between us every day and arrange carers. We did this willingly, so I am sure that your AC will help if needed as you have said you are a close and loving family. We never saw it as a burden, we loved my Dad. I do understand your reluctance to rely on them too much though. They have their lives to live and we were lucky that we all lived within 20 miles of each other and could together do what we hoped was for the best for Dad in the circumstances.
As I said before, I am sending you all my best wishes and hope that you will find the support you need.