I can't handle the responsibility of looking after my sick grandma. Any advice?

You're a good granddaughter and you obviously care very much about your grandma. However, it is not your responsibility to be her caregiver, not at your age. Let your parents handle it. Like someone else said, continue to be a good granddaughter, visit with her when you can and then go and begin your own life. If/when down the road your parents need some help then maybe you can revisit the situation but for not be 17! Be young! Have fun! And then tell your grandma all about it, I'm sure she'll love hearing about your life. :-)

Yes, all the above advice is true... When you look back at all this later you'll have a better perspective... You're just starting to experience life and there's so much more to offer... You deserve to be happy. Keep learning and growing and continue to nurture yourself as a self-sufficient, beautiful person. Try and avoid people taking advantage of your youth and vulnerability. I wouldn't move in with your boy friend as you're too young... This is my advise taken from my similar upbringing as yours... Remember, we're here for you. God Bless you Zoe. Lynn

All good advice. Are you still in high school? If not please at least get your GED if you did not graduate. There are many trades you can learn at the same time as your GED so at least you can get a good job and maybe continue trainng further. You are not responsible for your grandmother so don't let anyone guilt you into it

I see red flags, if parents do not get along with Nanny, they should not be moving in with her, nor should she be counting on them for help in her latter years.
This is difficult enough for besties!
Sounds dysfunctional, as in most relationship the fault or success lies in all parties, so do not feel too sorry from granny, her daughter is of her own making, so if they do not get along it is neither your fault, nor your responsibility / ability to fix.
Sounds like she has a large enough house, perhaps she should downsize and move to ALF.
It would be very unfair for her to count on a 17 yo to be her daily caregiver. You can and should remain in her life as a frequent visitor, but not taking on the daily chores.
Also, aside from caregiving advice, I have to say, young love is very hope-filled and fickle......please study something, anything that allows you some personal development, and a job should you need to maintain yourself and your children in the future.
Please wait to have children until you and your HUSBAND are stable in employment and have some savings and a life plan that excites both of you.
Please avoid children until you are at least in your 20s....