日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

I'm having problems structuring a sentence

Also, can you use こと twice in a sentence and not sound strange?

[They] have never heard of her
彼女のことは聞いたことがない

That seems maybe fine, but I've left out 'They'

This is where it gets weird, if I want to say 'They' how do I go along doing so?
彼たちは彼女のこと「particle」聞いたことがない
What particle do I use there? both は and が are used, and it just seems weird to use either in the middle.