In my opinion is it 2 major techniques to build self esteem and confidence.
1 goes on "you". This is said in general terms...I don't know anything about you...but since you ask and want a change...you have to be the leader.
It's very important that you give all parts of your family "praise" and "acknowledge" all the time. You have to be the supporter.
A wifes work is many times taken for "granted".
It's very important that she know that you are aware that housekeeping are a full time job and even more important then your job, even if you bring home the cash.
You might start to help, without her having the need to ask.
If the whole family manage to work like a group.... and you all know that all are depending on each other..... then this will build responsibility in the kids, build their self image,and make the bond stronger in all.
But it is important that you all are doing it together, and not as a imposed task...all have to feel they contribute....make a family gathering with pizza (or what the kids fancy)
once a week....change on the task....ask the kid what they them self think they can manage....let them be a part...give praise...never anything as granted.
For your wife I will also recommend that she start with Meditation and self development..many good books...this will give her more insight in herself....she will be much stronger as person and the whole family will benefit from it. I know....My wife has done it
Good luck.