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Use "stepchildren" in a sentence
"Somehow I overlooked the important fact that my stepchildren were the innocent ones thrust into a blended family."
"The Cinderella Stamp Society, founded in London in 1959 - refers to the so-called stepchildren of philately: an often bewildering variety of items formatted like postage stamps but not primarily definable as such."
"Blended families, such as stepchildren and adopted children, also are allowed."