I am divorced with 3 children. Daughters that are 9 and 11 and a 16 yr old son. I told my son and he has been involved with the entire process. He was even my driver for the surgery. I really do not want my ex-husband and his wife to know because then everyone on the PTA and soccer team and so on will know. So I originally told the girls I was having a stomach surgery and it was no big deal. Finally, as the surgery got closer I ended up telling them that the surgery would help me lose weight. They were so, so excited and started talking about shopping and all that. I made sure to never say the word "Lapband." I then explained extensively that this is something that is private and it's ok for families to have things that are private. I explained how important it is to not tell even one friend. They've done great. My ex even asked them what kind of surgery I was having and they said they didn't know. I really think its a judgement call and depends on the individual child and their maturity level.