What term is commonly used to refer to individuals who share the same parents?

The term that is commonly used to refer to individuals who share the same parents is "siblings." Siblings are brothers and sisters who grow up in the same household and have a direct familial relationship through their parents. This term specifically denotes the connection between children who have the same mother and/or father, making it distinct from other familial or social relationships.

Cousins refer to the children of one's aunts and uncles and do not share the same parents, while aunts and uncles are the siblings of one’s parents, representing another generational relationship. Friends are individuals who may share social or personal connections but do not have a familial bond. Therefore, the term "siblings" accurately captures the essence of individuals who share parental lineage.