Family sponsorship when PR renewal in process

[HOH]

Dear all,

What are your thoughts on the following issue.
1) Are there any immigration limitations for not sponsoring my family for immigration to Canada, at the same time while my PR card renewal is in process?

2) What would be the route for sponsoring family while inside of Canada? Should they apply for visitor visa first, and if approved and while in Canada to start with immigration application process?

Thanks muchly