If you have a late cheek in time, and arrive an hour early, there will be no line, no waiting and no reason why you can't check in and board together.
If you arrive at the earliest check in time when folks are waiting to board, they will likely NOT allow others ( not is a suite) to board with you.
When taking a family one may have to decide to enjoy suite benefits or to be with family. There are many suite benefits that will not apply to family who are not is a suite.
Enjoy the cruise.
M