His mother left home when he was 12.

他母亲在他12岁时离开了家。

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When I was 12 years old, my mother sent me to a Chinese school in California.

我12岁的时候，我妈妈把我送到加利福尼亚的一所中文学校。

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I didn't realize there was favoritism until my mother passed away 12 years ago.

12年前我母亲过世之前，我从没有感觉到哥哥得到的偏爱。

youdao

If his father resigns himself to Richard's subterfuge, his mother does not, and this is on page 12. He says: I had had my first triumph over my father.

在他击败父亲的同时，母亲以另一种方式教训他，在第十二页，他说：,“遵从父亲所说的让我第一次战胜了他。

耶鲁公开课 - 1945年后的美国小说课程节选

All I know about you is your one-sentence question, so I don't know whether you are 12 years old and feeling depressed or are the mother of a 12-year-old who has depression.

CNN: What can cause depression in a 12-year-old?

It reported that Janis Miles, the mother of a 12-year-old contestant whose face was burned during filming, filed a complaint in her home state of Georgia in June.

FORBES: A Buzzworthy CBS

Gallagher's mother helped raise her many brothers and sisters, after her own mother died when she was 12 years old.

WSJ: Ellen Gallagher, the Global Art Star | WSJ. Magazine May 2013