Hòumā duì yějītóu hé qīnshēng de yíyàng hǎo, bù róngyì.
The stepmother treated the non-biological kid as well as her own — that's not easy.
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Old colloquial usage, mildly pejorative. Modern speech prefers 继子女 (stepchild) or 养子女 (adopted child). Understand it in novels or dialect, don't use it to someone's face.
