Question about TRV application form

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Registered Users (C)
My in laws are in the US on B1/B2 visa (multiple entry). They would like to visit Canada to meet their relatives.

My question is do they have to apply separately (fill out separate forms) to the Canadian Conuslate or have just my father in law apply as a principal applicant and my mother in law as a coapplicant(single form). I am confused and any suggestions/answers would be much appreciated.
 
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