Thanks. Here they are referred to as second cousins. I’ve never heard “once removed” before. Maybe it is a colloquial thing.
My first cousin’s children are my second cousins. My parents’ first cousins are my second cousins.
The ordinals in the terms "first cousins", "second cousins", "third cousins", refer to the number of generations to one's closest common ancestor. When the cousins are not the same generation, they are described as "removed". In this case, the smaller number of generations to the common ancestor is used to determine the degree, and the difference in generations determines the number of times removed. Note that the ages of the cousins are irrelevant to the definition of the cousin relationship.
Then what are your parents' cousins' children to you?
According to my understanding, first cousins have the same grandparents, second cousins have the same great-grandparents, third cousins have the same great-great-grandparents, and so on.
The "once-removed" or "twice-removed" then refers to a generational skip.
Perhaps, in modern America, there is no longer a need to express these relationships with such precision.
But thanks for your feedback!
Regards,