Children may sometimes assume stepparent, foster parent, or adoptive parent names. Adoption by a stepmother or stepfather is called a "stepparent adoption". Most adoptions in the US are adoptions by a stepparent. Generally, stepparent adoption requires consent from all living, legally recognized parents. "Stepsiblings" (stepbrothers or stepsisters) are the children of one's stepparent from a previous relationship. In most cases, the stepparent can not be ordered to pay child support. Perhaps 25% of children ages 16 and under live with a stepparent.