Not going to happen. If the fire is such you cannot pass, and you use the exstingisher it will instantly make the room covered in smoke. You are not getting past it twice. I would go outside and break the windows to get the kids out.

Having fire exstibgishers are great for small stuff, and can save a lot of damage and hassle. But anything of size is dangerous.

Focus on prevention. Fire alarms in every occupied room, the ones where all ring if one ring. And being carefull with open flames, used batteries and never cooking unattended.