翻译：家长与孩子之间缺乏必要的交流。(lack)

The parents and the children are lack of necessary communication.

Parents and childre are lack of the necessary exchange
放心吧，绝对对了

There is the lack of the necessary exchange between parents and children .

Commucation lacks between parents and children。

there lacks some necessary communication between parents and children.

Parents and children are lacking necessary communication.