Physical & Emotional Abuse Support Group
Abuse is a general term for the treatment of someone that causes some kind of harm (to the abused person, to the abusers themselves, or to someone else) that is unlawful or wrongful. No one deserves abuse, period. Abuse can be emotional, physical, or sexual.
It's not your fault they don't know what a healthy daddy looks like, and there's nothing you can do about that. What you can do (and are doing) is protect them from an unhealthy daddy, show them that what he does is not acceptable, and show them what a strong and healthy mother looks like.
In saving yourself, you are also saving your kids. Pat yourself on the back for that. And for the fact that, already, they can see you for who you are.