I have five siblings, all brothers, do you have siblings?
I have no siblings, because I don't share my parents with anyone!  I'm an only child.
I know people who have half siblings, they share one parent.
Sibling relationship
Siblings play a unique role in one another’s lives that simulates the companionship of parents as well as the influence and assistance of friends. Because siblings often grow up in the same household, they have a large amount of exposure to one another, like other members of the immediate family. However, though a sibling relationship can have both hierarchical and reciprocal elements, this relationship tends to be more egalitarian and symmetrical than with family members of other generations. Furthermore, sibling relationships often reflect the overall condition of cohesiveness
Summary relative
Summary relatives are people in a state of relationship that occurs between the biological children of a couple and the biological children of only one parent of the couple. In other words, half-brothers or half-sisters do not share their parents, sharing a family relationship, but not a biological relationship. A family in which one or both spouses have children from a previous marriage, is called the pivot family.
It is wrong to call half siblings with a common father (that's right — "