Sibling

Siblings are people who share at least one parent. A male sibling is called Brother. A female sibling is called Sister.

Types of siblings:

• Full sibling: A brother or sister who share both biological parents.
• Half-sibling: A person who share just one parent with his or her sibling.
• 3/4 sibling!!!: 3/4 siblings are those who share one parent and whose non-shared parents are full siblings. It means that 3/4 siblings are at the same time cousins. I liked this example, and I am going to paste it:

"Queen Elizabeth I of England, the daughter of Henry VIII and Anne Boleyn, and Henry Carey and Catherine Carey, the children of Mary Boleyn. Before her sister married King Henry, Mary was Henry's mistress, and he is sometimes named the father of her children. If so, Henry and Catherine would be 3/4 siblings of Elizabeth" (http://en.wikipedia.org/wiki/Sibling#3.2F4_sibling).