What practical use do your children serve?
I do not understand the question. You aren't suggesting being a successful parent doesn't produce anything of value are you? Or are you suggesting that my enjoyment of my children and the pleasure of seeing them develop and enjoy their lives is not a real value? Or maybe you are suggesting that now they are grown productive citizens, raising their own families and producing more decent self-sufficient productive citizens has no practical value?
If this is what you are suggesting, I guess I can't answer the question.
Hank