I have a lot of mixed feelings after reading your posts.
When my parents found out I was born deaf, they were told by experts that sign was not good for me. They kept telling me that most people speak so I should learn to speak. I have no doubt that they would have implanted me as soon as possible. Thanks to my dad, one of my least favorite sentences is " Most people 
and I used to yell at him I'm NOT MOST PEOPLE.
The reason why I would want to have the child implanted is not because I want the child to be hearing but because I know all too well how inflexiable the hearing can be toward deaf, I'd want to make it easier to communicate with those who won't use sign or otherwise accomcate deaf needs. If I were pregant with a deaf child, I'd hope that she'd never need the surgery and that hearing aids will be enough to help her.
Even if the CI is a big success, there will be situations where she'd have trouble. I have no illusions about the CI making my child hearing. One of the first thing I'd do is enroll her in a Bi-Bi or if I can't find one, ASL only. I want her to be a native signer of ASL and I know I'm not the best model for that so I'd want to seek out deaf so she can learn how from them. I'm sure she'll notice the difference sooner or later.
I just hope that your dad will learn ASL and that the 3 of you can bond with each other using it. I must confess I don't feel comfortable signing with my parents even though they tried to learn signs and I was the last one in the family to learn it. It's like I'm doing something wrong. Don't ask me why. Let us know how things go with your dad and brother.
