Binadamu ni binadamu.
If you read the laws of human nature you will understand.
Humans will always put their interests first and that includes your wife and kids.
Nobody is special.
If your wife or kid sees that there is no reward for taking care of you when you get old and fragile, they will be nowhere to be found and you will be a lonely old bastard.
But if you're rich, they will flock around you.
Some fighting for your property before you die, and others playing nice so you can include them in the will.
It's called human nature and you can't change it no matter how much you hate it.