The offspring of a couple. They are brothers and sisters where both parents are the same. A parents existing children are step brothers and sisters to any existing children of a new partner and half brothers and sisters to any new children of that couple. The parent of a persons mother or father. The son or daughter of an uncle or aunt.
First cousins are people of the same generation with a common grandparent.
Generally just referred to as Cousins. Second Cousins Are the children of two first cousins i.e. the child of one cousin relative to the child of another cousin. The children of two second cousins are third cousins and so on. Removed Cousins Are from different generations. A first cousins child is a persons first cousin once removed.