I think that is one of the scariest things to face, that and the people whose children abandon them when they are old.
At some point you maybe should investigate assisted living facilities while the two of you are still together.

Sometimes it doesn't matter if you have children they end up not taking care of you anyway.
You need to make sure you have a plan in place and the money to take care of yourself.
Right now I am living with my brother. so at least I have a roof over my head. Who knows how long that will last.

Something else to do, is to have someone that you trust will honor your wishes as to your living will, named in your will, in case something were to happen to both of you and neither one were able to make medical decisions.

I would include your son in the conversation as well. My husband is in poor health and we've talked and we've planned and we've brought our daughter into the plans. So we all know what each of us wants - will do. Its much better to have talked it through when you can think and plan than make decisions in crisis. DD made wonderful suggestions and is alternate on both Health POAs and knows our wishes. Because we've been calm she's been calm and its comforting to know where we're going. Like the secret family word if we needed help or the fire escape plan and meeting location in an emergency. Preparations and plans mitigate crisis.

Make sure both your names are on everything.

Rann,
that might also be a question for a lawyer. For some things it might be better that it's not joint ownership.