She has been attending upon her sick mother for years.

她侍奉她生病的母亲已有多年了。

《新英汉大辞典》

In order to look after her sick mother, she asked for a month's leave.

为了照顾她生病的母亲，她请了一个月的假。

youdao

How happy he felt then, that he had all his strawberries for his sick mother.

当他把所有的草莓都送给生病的母亲时，他感到非常高兴。

youdao

It is about two poor children who must buy milk for their sick mother.

VOA: special.2009.10.05

She left high school early to care for her sick grandmother, then to care for her mother.

VOA: special.2009.03.08

Two years later, Billie's mother became sick and could not work.

VOA: special.2010.02.28

In it, a woman and her sick mother go to the temple for the first time in years.

BBC: Poster for Behzti

"He's going back to see his wife, who has been over in Australia nursing her sick mother, " said Robinson.

BBC: Thompson named in Scotland squad for Argentina tour

It was important to Aryeh that his sick mother should, under no circumstances, see this guest from her window not even his back, not even his silhouette against the grape arbor.

NEWYORKER: Heirs