Hi D.,
I just wanted to say a few things about this.
I grew up in a house where I did everything wrong and had to do things and my sister (4 yrs younger could do no wrong and do nothing.
For example, I had to clean my room and keep it clean now this is when we are 14 (me) and 10 (my sister), it was like this with everything. It made me feel like I was always a bad kid and she wa an angel. And it's not like I was just complaining my Dad recongnized it also and my parents would fight over this.
So now I am 32 yrs old and raising my children. Their ages are B- 16 yrs, B- 7 yrs, G-4 yrs, and a G- 15 months.
Now I have an all different ages of children but the rules in my house apply to everyone and if I am gonna let one get away with something then I let them all get away with the samething (like eating a snack before dinner even though it's 10 minutes from getting on the table.
But there are also different ways to discipline your kids. For instance with my 16 yr old he gets grounded, Xbox 360 taken away, no going to friends houses, no computer time. With my 7 yr old, all you do is give him the look and he is getting back on track but sometimes we have to tell him he will not get to go to his friends house or no Xbox. Now with my 4 yr old it is more time out or standing in the corner and telling sorry to the person that she may of hurt or whatever. And then you have my 15 month old who is a work in progress on all accounts.
From my experience here are a few things I have learned with my kids (and still learning)
1) be consistent with your rules across the board.
2) pick you battles
3) You and your husband need to be on the same page about the rules that you want your kids to follow. for you 2 "you can agree to disagree but not infront of your 2 children"
4) If you say this child is going to the corner or has go to his/her room then A) yu have to follow thru and B) dad needs to back you up
5) have confidence in yourself that you can be consistent with both of them.
Hope this helps, W.