I agree with Matthew. Your family is inviting him as a friend - the point will be, does he convince the officer assessing the TRV application that he intends to return to his home country at the end of his authorized stay? It's a difficult balance - but it's not really misrepresentation. The point is not so much that he doesn't intend to return right away - the point is that he recognizes that he will have to go back if his PR is not approved, and that he intends to apply to extend his status once he's in Canada so that he maintains valid temporary residence until a decision is made. That's "dual intent".
From the OP11 Processing Manual, Section 5.4:
Dual intent
An intention by a foreign national to become a permanent resident does not preclude them from becoming a temporary resident if the officer is satisfied that they will leave Canada by the end of the period authorized for their stay [A22(2), R183]. The person's desire to work, study or visit in Canada before or during the processing of an application for permanent residence may be legitimate. An officer should distinguish between such a person and an applicant who has no intention of leaving Canada if the application is refused. An officer should also keep in mind:
• the time required to process an application for permanent residence, because the length of time will affect the applicant's means of support;
• obligations at home; and
• the applicant's likelihood of leaving Canada if the application is refused.
Refusals
A22(2) is an inclusive—not exclusive—statement. It permits officers to issue a TRV, or approve a study or work permit, where someone demonstrates legitimate intention to become both a temporary resident and, at a later date, a permanent resident within the confines of IRPA's Regulations. This provision of the Act permits officers to be flexible in their assessment of these cases, since a legitimate intention to become a temporary resident does not preclude an individual from obtaining permanent resident status while in Canada as a temporary resident.
There is more information in the Section - I won't reprint it all here - but it talks about officers balancing the "rigidity" of R179 against the flexibility of A22(2), "which allows the officer to assess the applicants intent in relation to the particular circumstances of the case".
R179: An officer shall issue a temporary resident visa to a foreign national if, following an examination, it is established that the foreign national
(a) has applied in accordance with these Regulations for a temporary resident visa as a member of the visitor, worker or student class;
(b) will leave Canada by the end of the period authorized for their stay under Division 2;
(c) holds a passport or other document that they may use to enter the country that issued it or another country;
(d) meets the requirements applicable to that class;
(e) is not inadmissible; and
(f) meets the requirements of section 30 (Note: pertains to medical examination)
A22(1): A foreign national becomes a temporary resident if an officer is satisfied that the foreign national has applied for that status, has met the obligations set out in paragraph 20(1)(b) and is not inadmissible.
Dual intent
(2) An intention by a foreign national to become a permanent resident does not preclude them from becoming a temporary resident if the officer is satisfied that they will leave Canada by the end of the period authorized for their stay (note: and/or apply to extend that status from within Canada to maintain their temporary status until a decision is made on permanent status.).
