We've also got a list of resources on this topic on our website here http://www.breastcancercare.org.uk/breast-cancer-information/impact-breast-cancer/relationships-family/telling-family-friends/resources-parents-children-secondary-
It includes books for parents/carers, books for children and some useful organisations and websites.
You may find it helps to talk this over with our Helpline staff. Opening times are 9-5 on weekdays and 10-2 on Saturdays. The number is 0808 800 6000. Calls are free and confidential.
Very best wishes