stepson
Refers to a son from a spouse's previous relationship. The term is neutral and factual.
His stepson will graduate from high school next year.
Standard kanji spelling for 'stepson'.
Mixed kana-kanji spelling, sometimes used for clarity or when the kanji 継 is less familiar.
Compound of 継 (まま, 'step-', as in step-relationship) and 息子 (むすこ, 'son'). The prefix 継 is used in several kinship terms for step-relations.