Is it right for parents to expect from the child's earning?

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It has been ages that we have been coming across some people who think selfishly sometimes.Some parents bring up their children,really care,look after them and all.But it all turns the other way when the child starts earning.They start expecting they child to contribute.They do not think if the child is able to meet his own needs outside where he works and if he tries to explain,they hardly wish to even listen.Then misunderstanding happens.In some cases worser things happen as if the child is a guy and he falls in love after he starts earning,some parents try much even to break his relationship.The only thing that goes on the parent's mind will be to take his money.they think if he gets married,they cannot anymore take the money from the son for their need.Isnt love what comes from parents true.Was it always with expectations?love is true only when it doesnt expect to get something in return.