I don't have children, but, if I did, I wouldn't want "Happiness" for them. I'd want for them to find the inner strength to weather the ups and downs of the life laid before them.
I don't have much affection for people who think Happiness is over the next rise. Either, they believe every lie politicians spoon them, or they already own three houses and want ten more. Then they'll be Happy, right? What they're doing is confusing Happiness (whatever the fuck that is!) with Stimulation. They're stimulated by ostentatious symbols of their wealth -- or stretched credit limits. The stimulation they feel is a real thing, but it doesn't last long. That's why they need it all the time.
These are the same folks who insist on movies with Happy endings. Happy endings work for them because they support their grand delusions. Happy endings keep their easily popped bubbles afloat. These folks figure that if they can keep enough delusional bubbles swirling around their heads, they'll never need to face Reality.
I'm fine with Happy endings, but I feel much more comfortable with what is sometimes called the Downbeat ending. Downbeat endings never depress me. On the contrary, they support my belief that most of what happens to us in life is random. To the universe, there's no good or bad. There are just acts. A kiss. A kill. A drop of rain falling. An anus filled. A flower blooming. A child hugged. A child beaten. A city decimated by a quake. A bird singing. A koala born. A forest ravaged by fire. Thirst quenched by Summer rain. If we think we control most of these things, we're living on a cloud.
I don't believe in karma, either. The attribution of karma to an event implies a belief (in the attributor) that justice is eventually served. That life is basically fair. That the bad guy gets his comeuppance. That the good guy gets the reward. That God will defeat the Devil.
Life guarantees us unpredictability.
For me, this Truth (a personal one) is my launching place. It enables me to weather the storms because it doesn't lead me towards a false horizon. I'm already where I can Be. The trick is making the most of the accidental fortunes of life -- friends, family, art, and nature -- and whatever else you can forge from the anarchic debris.
I love movies and literature where anarchy reigns, where the worst happens to the best of us, the best happens to the worst of us, and the universe reminds us that it is in charge.
It's incredibly liberating to not expect justice or love or commitment or dominion or loyalty.
Arriving at just Being, and appreciating the cold and heat of THAT... is my measure of "success".