I've added a little guide to calculating your family tree in less than an hour if you have a tree on Ancestry.com.
The last generation is your 3rd Great-Grandparents.
As you click the arrow after each 3rd GGP, their branch opens to show up to the 7th generation.
Count how many 4th, 5th, 6th, & 7th GGPs you have and added them to the box indicated on this chart
how many ancestors possible for 4th - 7th generation using this chart:
4th column - 2
5th column - 4
6th Column - 8
7th Column - 16
Complete one of these for each parent.
Add it to the chart and calculate your percentage
Happy New Years!!
May you break down many brick walls in 2014!!!!