Here is your assignment if you choose to play along (cue the Mission Impossible music, please!):
The challenge: Find a living male person in your database from your maternal grandmother's patrilineal line who could take a Y-chromosome DNA test. Answer these questions:
1) What was your mother's mother's name?
2) What is your mother's mother's patrilineal line? That is, her father's father's father's ... back to the most distant male ancestor in that line?
3) Can you identify male sibling(s) of your mother's mother, and any living male descendants from those male sibling(s)? If so, you have a candidate to do a Y-DNA test on that patrilineal line. If not, you may have to find male siblings, and their descendants, of the next generation back, or even further.
4) Tell us about it in your own blog post, or in a comment on this post, or in a Facebook or Google Plus post.
Here is mine (as an example):