Therese -
First off give them the AAP policy statement. You can find it at:
http://www.aap.org/policy/re9729.html
Dr. Jon Ahrendsen, MD, FAAFP had compiled a wonderful "Advantages of BF" web
page complete with medical references! Go to:
http://www.webpro1.com/cindy/advbf.html
You should also get in touch with LLLI legal advisor Liz Baldwin. Go to LLLI
"BF and the Law" at: http://www.lalecheleague.org/LawMain.html
Good luck to you! Sounds like the dad is a real slime ball. IMHO.
Cynthia D. Payne
LLL of Berkshire County Massachusetts