对他们

to them; for them, toward them; with them (when describing how you treat them)

→ 对
phrase Uncommon #11,231
to them; for them Marks them as the people affected by something or to whom something applies. The best English equivalent depends on context.
CH: 你们知道这个条约对他们意味着什么吗?
EN: Do you know what this treaty means to them?

妈你是不是又对他们说了什么不好的话?

Mom, did you say something nasty to them again?

— 萤火虫之墓 (1988)

父母要对他们子女的安全负责。

Parents are responsible for the safety of their children.

你们知道这个条约对他们意味着什么吗

Do you know what this treaty means to them?

— 风吹麦浪 (2006)

应在生命终结时对他们提这些问题。

These questions should be asked of them at the end of their lives.

— 飞向太空 (1972)

但关于老爸我应该对他们说些什么?

But what should I say to them about Dad?

— 落水狗 (1992)

phrase Rare #20,230
toward them; with them (when describing how you treat them) Often followed by a word or phrase describing an attitude or manner, as in 对他们狠一点, “be a little tougher on them.”
CH: 你也应该对他们狠一点。
EN: You should be a little tougher on them too.

但我对他们的做法很有意见

But I have a lot of issues with the way they do things.

— 机械师 (2004)

船长对他们好点

Captain, be a little nicer to them.

— 雨水危机 (2011)

因为你对他们也真太有耐心了

Because you’re really far too patient with them, too.

— 放牛班的春天 (2004)

你很懂得如何对他们.

You know very well how to deal with them.

— 你妈妈也一样 (2001)