I would like to close the parent issue unless all the child tasks under parent tasks are set to be in DONE state. But in jira am able to close the parent ticket if child tickets are not yet solved. How can we avoid this.
You will need to set a condition on the parent's close status transition in the workflow.
Several apps include capabilities to create such a transition: ScriptRunner, JMWE, ...
But if I'm not mistaken there is an out of the box condition called Sub-Task Blocking Condition.
Thats correct. you need to add new condition "Sub-Task Blocking Condition":
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