Why do some children think it's alright to talk about 'Inheritance?

Why do some children think it's alright to talk about 'Inheritance' whilst their parents are still alive or dictate to their aged parents on how to live their life or spend their money?... Surely, we all know the most important thing parents owe their kids is to give them a good upbringing and a good education, after which they'd have to make their own way and also become successful....Inheritance and taking over parents wealth can only be done by parents consent or wait for their Will to be read after their death ...or No?

Its the parents fault for making their kids mentally lazy. I know one family like that and there are many in the world. The mother manipulates their kids to fight their father because she had done nothing to earn her respect or make savings, so she uses her kids to protect her perceived rights even when the father denied them nothing and or the father along side used money to win their silence/obedience while they were kids. Both stopped them from going after their lives. Every-time they wanted to get married to those they loved he would threaten them with pulling out financial support. When the children rebelled he would do so and when they in hard times they had nothing to fall back on returned back to the parents rather than say "F" them i will chop grass if need be. The kids while young were arrogant to their peer mates so they had no one to go to ask for help or partner with. They always thought they were better than others. Both parents are egomaniacs.

Haven't you heard in nature there are animals who eat their own to survive? Same it is with humans who keep their kids to feel irrelevant because the parents never built anything in common apart from money and the children that grew to despise them for their cowardice in not cutting off. Sorry for being brutal but ......the truth is bitter.