TRV renewal from within Canada for my dependents having valid visitor status

[MrEnergy]

Hello,

I have a valid Study Permit, my wife has a valid Open Work Permit, and our two kids are having a valid visitor status,
I have also a valid TRV, but my family don't
I wanna apply for TRV renewal for my wife and our dependents
I wanna do that from within Canada
I know that is OK for my wife, but how about our kids (VISITORS) ?
thanks !