Stepchildren

A stepfamily or blended family is a family where at least one parent has children that are not genetically related to the other spouse or partner.

Either one parent may have children from a previous relationship.

Children in a stepfamily may live with one biological parent, or they may live with each biological parent for a period of time.

In addition, visitation rights mean that children in stepfamilies often have contact with both biological parents, even if they permanently live with only one.

A child is referred to as the stepchild, stepdaughter or stepson of their biological parent's new spouse, and that person as the stepparent, stepfather or stepmother of the child.

Source:https://en.wikipedia.org/wiki/Stepfamily