If two related people are described as "Cousins, once removed" it means that one of them is one generation further removed from their youngest common ancestor than is the other.
If Joe and Jane are First Cousins, once removed, and their youngest common ancestor is Joe's grandfather, then that common ancestor is Jane's great grandfather.
If Joe and Jane are Second Cousins, once removed, and their youngest common ancestor is Joe's great grandfather, then that common ancestor is Jane's great great grandfather - and Jane's parent is Joe's Second Cousin.
A cousin relationship is "twice removed" if the two people are in different generations and one is the grandchild of the other's unremoved cousin.
The children of your first cousin once removed are your first cousins, twice removed, or they are your second cousins, depending. The children of your second cousin once removed are your second cousins, twice removed, or they are your third cousins, depending.
They would be your parent's first cousins once removed. So they would be your first cousins twice removed. They are two generations away from you so they are twice removed.
You are out of synch by two generations. So they would be first cousins twice removed.
It would depend on which way they are removed. If they are your parent's first cousins, they would be your second cousins. If they are the grand children of your first cousins, they would be first cousins twice removed.
You are out of synch with the common ancestor by 2 generations. It would be first cousins twice removed.
They may be second cousins. They could also be a cousin twice removed.
The children of your first cousin, twice removed are either your first cousins, three times removed, or your second cousins, once removed. Which of these relationships applies depends on which of you - you or your first cousin twice removed - are in the older generation.
my first cousin twice removed.
You do share a common ancestor. You parent would be a fifth cousin one removed. You would be a fifth cousin twice removed.
Your grandson and your first cousin are first cousins, twice removed. Your grandson and your second cousin are second cousins, twice removed. and so forth.
Depending on which of you is in the older generations, the children of your first cousin once removed are either your first cousins twice removed, or your second cousins.Depending on which of you is in the older generation, the children of your second cousin once removed are either your second cousins twice removed, or your third cousins.
Your first cousin's grandchildren are your first cousins, twice removed. Your second cousin's grandchildren are your second cousins, twice removed. And so forth.