Hi fadetoblack

I think that you have raised a lot of complex issues in your post.

One is this:

"Thing is my mom's mind at 70 is perfect. She has no issues with anything brain and age related, her brain is like a 30 year old's.

If this was genetic my mom would sure have it, right? And with FTD if even inherited, you get the same subtype, right, not a different one?"

The genetics of FTD is complicated. In many cases it arises from what is called an autosomal dominant mutation in one of a number of genes. What that means is that your grandfather's possible FTD might have arisen from that - one possible "bad" autosomal dominant mutation might have been causal for him.

If that was the case for your grandfather (which I do not know) your mother would have had a 50% chance of inheriting that mutation from her father. The fact that your mother is fine means that she has not inherited that possible mutant gene and so you have not either.

All the best.