They are out of synch by a generation. They would be first cousins once removed.
Your first cousin's cousin could be your, your siblings or one of your other cousins. The precise relationship depends on how that cousin is related to your first cousin.On the other hand, every one of your cousins has cousins who are related to them through their parent who is not a sibling of your parent. Thoee cousins are not related to you at all.
You would have a variety of different relationships to the cousins of your first cousins. Some of them are you and your siblings, and some of them are also your first cousins. Second cousins of your first cousins may also be your second cousins. In addition, your first cousins will have many cousins who are not related to you at all. You are lreated to your first cousins because each of you have one paret who is a sibling of one parent of the other. But each of you also has one other parent, who also has siblings and the children of those siblings are cousins to one of you but not to both.
Anyone descended from a brother or sister of one of your direct ancestors is your cousin. There are different names for different kinds of cousins. For example, your first cousins are the children of your aunts and uncles. Your second cousins are the grandchildren of your great aunts and great uncles. Your parents'first cousins are your first cousins, once removed. And the children of your first cousins are also your first cousins, once removed.
Your are related to some of your first cousin's aunts and not to others. The aunts of your first cousin to whom you may be related are your mother and her sisters or your father's sisters. One of the parents of your first cousin isn't related to you, but married into the family. Anyone of your cousins aunts who are related to that person would not be related to you.
They are out of synch to a common ancestor by one generation. That would make the first cousins once removed.
Your granddaughter and your first cousin's grandson are third cousins to each other. You find their common ancestor that is, your grand parents, and count the number of generations separating them, there are Brother and Sister then cousins, you and your cousin would be one (first cousins), your children and your cousins children are second cousins and their children are third cousins and so on.
Two people whose great grandparents were siblings are third cousins to each other. The children of siblings are first cousins. The grandchildren of siblings are second cousins to each other. The great grand children of siblings are third cousins to each other.
Yes, of course your son and your great niece are related. They are first cousins, once removed, to each other. (Your great niece's parent, your niece or nephew, and your son are first cousins to each other.)
Yes. The grandparents of one are the great-grandparents of the other.
You are always related to your cousins, no matter how distant they are. Being a cousins means that you share at least one ancestor with each other.
If Joe's grandfather and Jane's great aunt were first cousins, and Jane's great aunt was the sister of her grandparent, then Joe and Jane are related as third cousins. But if Jane's great aunt is married to the brother of her grandparent, Joe and Jane are not related.
If two people are first cousins, the children of one are second cousins to the children of the other.