Are you the lost grandgrandgrandgrandgrandson of my grandgrandgrandgrandgrandfather?!
Maybe! Would that make us 7th cousins? =p
By the way, what does 'once removed' mean?
One generation. "1st cousin twice removed" means the person referred to was a first cousin of you grandmother/grandfather. Each "remove" indicates a generation.
For example: say your grandmother on your mother's side was a first cousin of X. Then your mother would be a first cousin once removed of X, and you would be a first cousin twice removed. Your child would be a first cousin thrice removed to X. Using the "removed" system of cousins immediately tells you what generation you're talking about, and whether you're a contemporary or the grandchild of X's first cousin.
There's another way of designating cousins where you just increase the "number" of the cousin for every generation. So, taking the same situation, where your grandmother and X were first cousins, your mom would be referred to as a "second cousin" of X (instead of a" first cousin once removed"). It can be confusing. So what would be relation to the children of your mom's first cousin, named Fay? Okay, you are a first cousin once removed to Fay (or a second cousin depending on whic hsystem used). Then Fat's kids would be your third cousins, and fourth cousins to your kids.
My head hurts.