This is such a cop out.
"And on behalf of my brothers and sisters, I am deeply sorry we have hurt you. The scope of all this is so huge, we can never truly make amends for all the years and all the people we’ve hurt."
Maybe you don't really understand about amends. When you can't actually repair all the damage you have caused you must still do everything you can for the rest of your life. You can't brush it off with some token gesture and say we have done what we could. While you live there is more you can still do to make amends. Can you claim on behalf of your brothers and sisters that they will do everything they can for the rest of their lives to repair the damage they have done?