Please explain how first, second, third and so on cousins work?

Question

Also what does ‘once and twice removed’ cousins work in that context?

In: 14

Answer 1

First cousins are often simply called cousins; you have your grandparents in common; one of your parents is a sibling of one of their parents. Second cousins have great-grandparents in common; their grandparents are siblings.

If your first cousin has a kid, the kid is your first cousin once removed. The kid of your first cousin once removed is your first cousin twice removed. And so on.