What Can I Do If My Grandfather Will Not Accept Any Help?

Well...what are you trying to help him with? Some examples would be nice :)
and sometimes elders feel like they can do it themselves. Because when your old,your weak
and its annoying sometimes to know you cant do the old things. Give your gramps a few space.
But when he really needs it, just tell him! "i want to help u!". If he still says no, then just be there
to watch,and witness wat he can do, and if it looks like anything dangerous, still be there for backup.

Hope this helps,~