My twin sister has had a heart attack and on blood thinners. My younger brother has just had a stroke and the prognosis isn't good as yet. He does seem to be improving. My older brother is a drunk living many miles away from me. Parents are dead; and, I only have one aunt still alive. She will be 90 soon. I never married or had children. I have Fibromyalgia and one cat. I have a lot of cousins; but, I am not close to any of them. I will be 70 in September and am the person who is requested to solve all family problems.
I would also say, if you are going into your own old age alone, you might want to think down the road and do some planning now re: what you might do as YOU need more help physically and more resources to exist. Perhaps comparing the costs of independent living to the costs of living on your own, might help you see that a move into a full service facility where you can start in your own independent living apt but as you might need Assisted Living or nursing home or memory care down the road, it's all there under the same roof. I am looking at such issues for my Mom who is home alone but not able to care for self as she once was. I was amazed that when I added up all the costs of maintaining her house, utilities, taxes, insurance and the costs, at 89 yrs of having a car was way more than the rent on a nice independent living apartment. In the places I've been checking out for Mom....some require a certain amount of time living there at private pay, but then, when you run out of money, you can apply for Medicaid to cover the costs and the facility will have people who help you do that and get qualified for some assistance. The less resources you have left, the easier it is to gain qualifications for gov't assistance. But, then you have your own support system in place. In independent living, you can come and go as you please, generally have your own care...and it's like renting an apt there, but you have options to join in with activities and eat in the dining room if you don't want to cook a certain meal. It may not be what you need right now, at 70...but I am just saying, for me to find out how this works, it seems like a good long range plan to consider for someone without family, or who is alone but doesn't want to have to ever move in with family down the road. I am considering such a move for husband and myself, because our daughters and their families are out of town, have their own issues in life too and my husband is recently diagnosed with Parkinson's disease. Even as a retired RN, I know that right now, I don't have the physical ability to care for him as he declines and seeing what my parents are going through because they both got into that negative place of: " I am never leaving my home, no matter what, I am living here til I die...." place, I think the time for good decisions is before that enters our minds! Just plan what situation will cause the move, and get on with it. To that end, we are planning to start the down sizing process of going room to room and cutting back on things we do not really need anymore....giving things away to the girls and grandkids NOW and stuff like that. We have our trust and wills and POA all taken care of....so it's just a matter of deciding that we need more help and cannot do it all ourselves. That way, we won't force our kids to make difficult decisions on their own, while we are in our elderly negative state of mind!!
More details might result in more detailed responses. But basically you need to put your own needs first, as Chicago says.
It may be that each of you will have to consider some outside help.
I am sorry about your twin. You have a lot on your plate. Take care of yourself, #1. Then, see who else you have time for.