Sibling rivalry often causes parents anxieties.是什么意思？

Sibling rivalry often causes parents anxieties.

手足之争常让父母忧心忡忡。

sibling

n. 兄弟，姐妹，[生]同科，同属，[人]氏族成员；

rivalry

n. 竞争，对抗，对立，竞争行为，对抗行为；

例句
It was Allen who fired this rivalry with real passion...
是艾伦为这场较量注入了激情。

often

adv. 常常，经常，时常，再三；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

causes

n. 原因( cause的名词复数 )，动机，（某种行为、感情等的）理由，缘故；

例句
Allergy to cats is one of the commonest causes of asthma.
对猫类过敏是哮喘病发作最常见的诱因之一。

parents

n. 双亲（ parent的名词复数 ）；

例句
Some parents believe a boy must learn to stand up and fight like a man.
有些父母认为男孩子必须学会像男子汉一样顶天立地，勇于抗争。

anxieties

n. 焦虑( anxiety的名词复数 )，担心，焦虑的原因，渴望；

例句
Many editorials express their anxieties about the economic chaos in the country.
许多社论对该国经济的混乱状况表示忧虑。