We begin life with 4 Grandparents
Each Generation thereafter doubles
Great-Grandparents 8
2nd Great-Grandparents 16
3rd Great-Grandparents 32
4th Great-Grandparents 64
5th Great-Grandparents 128
6th Great-Grandparents 256
7th Great-Grandparents 512
8th Great-Grandparents 1,024
9th Great-Grandparents 2,048
10th Great-Grandparents 4,096
11th Great-Grandparents 8,192
12th Great-Grandparents 16,384
13th Great-Grandparents 32,768
14th Great-Grandparents 65,536
15th Great-Grandparents 131,072
16th Great-Grandparents 262,144
17th Great-Grandparents 524,288
18th Great-Grandparents 1,048,576
