How can one be happy in a world full of chaos? That's easy, fill your life with the things that make you the happiest. For me, those things are God, my family, my dogs, and writing. I choose not to surround myself with negativity or stressful things. Know what causes you to be filled with stress then eliminate that from your life. Now obviously you cannot eliminate your children or family members but you can find ways to change what it is that is causing you to become stressed by them. Perhaps, you need to take some time for yourself once a week. Do something you enjoy.
Life is too short to not live it abundantly. Choose to live it happy and stress free. That's how I intend on living mine.