I'm going to confuse things further now
I came across this, and I don't think it's right.
https://anthonyadolph.co.uk/how-to-work-out-cousinshipYou are your second cousin’s second cousin, for example. Where it becomes complicated, again, is when there is a difference in the generations.
Say your first cousin X has a child, Y. Y is your first cousin once removed, as we have seen above. But if you want to describe the situation from their point of view and say ‘I am Y’s …. cousin’ you must start with their position on the family tree.
From Y’s point of view, they are looking across the family tree, on their line, at the space directly below you. If you have a child, then that child is Y’s second cousin, but whether or not you have a child is irrelevant. What is relevant is that you are one generation removed from that position. You are therefore Y’s second cousin once removed.
I've checked this out on my genealogy software (Family Historian) which shows relationships. For instance, my grandmother's first cousin is my first cousin twice removed. Changing it round so that he is the root, his relationship to me is exactly the same - first cousin twice removed.
