Thank you for replies
I think my main worry really is that I don't want to be alone without family when I am in my twilight yrs, I expected that I'd have remained close to my nephews and nieces but my siblings have turned their back's because of their ignorance about my partners illness. And I worry that although I/we would cope my partner would resent my decision. . . .
I say my decision because he has made it clear as far as he is concerned it is exactly that my decision

he tells me he's 50/50 as to whether it is appropriate for us to become parents, but when he told me his views led me to believe that if I do choose motherhood I will be dealing with a lot of things on my own and when things get hard (which I know they will, I'm not naive) his attitude is likely to be you made your bed lie in it !
What to do ? Dammed if I do and dammed if I don't