Only the extended family member, who is related can travel. If the related family member is not a PA, they cannot land or travel on the PR visa. They will need a TRV.
Though when you apply for AL, you can request is for your entire family. But it will depend o the discretion of the visa officer.
I have a question and this seems like the best place to post. My wife and I have been invited for PR, submitted our application and included my 10 yr old daughter who still lives in Jamaica. I would love for her to start school here in September (hopefully flights resume). What would I need to do to facilitate this. I want to apply for her TRV as I'm sure we won't get PR acceptance by August. Can anyone guide me? When I checked the processing times for TRV tonight it said 211 days. I will want her mother to bring her and spend 2 weeks to help her get settled before returning home.