stepchild [stepchildren](the child of one's spouse from his or her previous partner) noun [UK: ˈstep.tʃaɪld] [US: ˈstep.ˌtʃaɪld]
stepdaughter [stepdaughters](daughter of one's spouse and not of oneself) noun [UK: ˈstep.dɔː.tə(r)] [US: ˈstep.ˌdɒ.tər]Mary is John's stepdaughter. = Mary es la hijastra de John.