My maternal grandparents sides BOTH show hairloss as do I.
My maternal grandparents sides BOTH show hairloss, but I don't.
NEITHER OF maternal grandparents sides show hairloss, and I don't either.
NEITHER OF maternal grandparents sides show hairloss, but I do.
My grandfather lost his hair, grandmother's side didn't, and I did or am losing hair.
My grandfather lost his hair, grandmother's side didn't, and I have no hair loss at all.
My grandfather didn't lose his hair, grandmother's side did, and I did not lose hair.
None of these apply to me.