A second cousin once removed is either the great-great-grandchild of your great-grandparent, or the great-grandchild of your great-great-grandparent. That is, you are separated by one generation (once removed), and the closest common ancestor you have is a great-grandparent (either the cousins or yours).
What is a second cousin twice removed?
For example, if your cousin counts back three generations while you count back five, then you would be second cousins twice removed. The “second” would be due to the number of generations back your cousin counted to a common ancestor, and “twice removed” thanks to the difference in generations between you.
Is 2nd cousin close?
First cousins are as close as you can be and still be cousins. It means that the closest ancestor that two people have in common is a grandparent. (If they were any more closely related, they would be siblings.) Second cousins means that the closest common ancestor is a great-grandparent.