Your cousin in-law
John.
If there is no living spouse, the children inherit, after them the siblings. If there is no living spouse, children or siblings, parents inherit, after them first cousins, then second cousins, etc.
Yes
The cousins of your in-laws are not related to you and neither are their parents. However, the parents of your spouse's first cousins are your spouse's aunts and uncles, and thus your children's great aunts and great uncles.
Second cousins
One of her cousins are called Ellie Cosgrove.
The Cornish Cousins
Your uncle or aunt's children are called your cousins.
If your 3-great grandfather was the father of your spouse's great grandmother, then you and your spouse are third cousins, once removed to each other.
To your mother, they are first cousins once removed. To you they are second cousins.
One of his cousins are Donald Dwight
Louis doesn't have any cousins.
Your cousin' spouse becomes your cousin by marriage (cousin-in-law). The reason for this is that they have the same relationship to you.