CASE: subtasks that will not shown under the main tasks.

THE ISSUE:

When I publish a task with its subtask and there is a date on task, both task and subtask are published.
However, when I publish a task with its subtask but only there is date in the subtask, only the subtask is published.
This have a problem for me: to remember what is the main task to which belonging one subtask in that cases.
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This is so because the subtasks will be shown in two cases:
a) under the main tasks on the due date of the main task or,
b) on the due of the secondary task, if added.
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Then, actually, there is no information about the belonging of the subtask in the b)-case scenario.
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THE PROPOSE:

I then propose a new feature in the application consisting of providing information in some manner about the task to which a subtask belongs in case b).
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Thank you very much,
Best regards.