This is Carol, Steve's wife.  We agree that starting with your own family is great.  Your children will learn what house church is all about and to participate.  Also, it is easier to bring other families in when they see first hand the role children play in the house church.  
We know a family who considered a number of years ago pulling back from their local assembly, but decided against it because of their children's need for fellowship. Now that their children are older, they have some regrets because they see how tied their children are to the institution.
Pray about it and proceed as Jesus leads.