Simulate Grandparents Coordinates
Estimate other grandparents from grandchild and one known grandparent (~25% each).
This tool estimates the average G25 coordinates of the unknown grandparents when you know the grandchild and one grandparent's coordinates.
Formula: OtherGrandparents = (Grandchild - Percent × KnownGrandparent) / (1 - Percent)
Default contribution is 25% (typical for one grandparent).