Who Are The Grahams

I have a sentence: They are planning to have holidays soon. What will be the question? Who IS planning to have their holidays soon? or Who ARE planning to have their holidays soon?

Who are or who is? - English Language & Usage Stack Exchange

Pretty funny how (for me) this is the second google search result for “who are vs who is” and it’s closed as off topic and has a wrong answer.

"Who are" vs "who is" - English Language & Usage Stack Exchange

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Possible Duplicate: Is a company always plural, or are small companies singular? When asking about the identity of a business/company, which of these is the most correct? "Who is [Company]?" ...

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"Who is" or "Who are"? - English Language & Usage Stack Exchange

In the following sentence should it be "you who is" or "you who are"? I can make a case for either in my mind. For example, if you turn the sentence around a little bit, you could say, "Tonight, ...

"You who is" OR "you who are" [duplicate] - English Language & Usage ...

What is he? -- Does the question refer to what he is doing for a living? Who is he? -- Does it refer to his name? For example, he is Peter.

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What is he? vs Who is he? - English Language & Usage Stack Exchange

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I want to know if which one is correct, for example I want to say: "The people who is in charge of this process" or "The people who are in charge of this process". I'm a bit confused because of the...