is TRV for family dependent on their valid visitor status in Canada?

[jvsitd]

9Hi,

My currently work permit & TRV is expiring on 28-Dec-2014.
My wife and kids's dependent visitor record/permit is also expiring with me on 28-Dec-2014.

I am planning to apply for Bridging Work permit (BOWP) before 28-dec-2014 and go back to my home country.

My question is:

1: Do i need to apply visitor extension (5708) for my wife and kids along with my application for Briding work permit if i am planning to go back to my home country just after work permit application?

2: When my BOWP is approved and i want to return to Canada, Can i apply for TRV for myself and my family based on approved BOWP?

3: Do my wife and kids need to have applied 5708 to support TRV or just my Bridging open work permit sufficient for my family's TRV as well?