K.C.
My oldest daughter isn't my hubby's bio daughter but loves her like his own. We had the same problem when we were first married. You both need to be on the same page with dicipline. That was our problem. We have a 3 and 1 year old together and I now see the 3 year old gets the same dicipline her sister got at the same age. Just sit down and have a calm talk with hubby chance are when your daughter gets a bit older hubby will be just as hard on her as well. Just make sure you both are on the same dicipline page! Good Luck!