Good on you! If you keep reading the various forums in this web site you will find a lot of support and stories of people who have trodden this path. In relation to the children, ask David, via the http://sweetpoison.com.au/ web site for strategies. He says that he can control what his children eat away from home, but he can control what they eat at home. As with all social problems, education is the key to change, and the earlier the better :-)
Do keep us posted on your progress.
Kind regards
JojnN