The Number of Gs in the Family Tree

The number of Gs tells you how far up your ancestral chain you have to go before you get to someone. So the cousin value always matches the G value of the parent you had to go to. Your siblings, you only have to go up to your parents and then down to your siblings. If you were doing this tree on like a piece of lined paper, then siblings and cousins would all be on the same line because we're all the same generation.