'Unity - Parenting an object hides it

I am trying to parent some objects but when I do so, it hides them and my game doesn't render them. any help?

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Solution 1:[1]

To correctly parent an object to another, you will need to consider a few things:

1- The parent object must be active and visible, so its child objects are visible too.
2- The parent must not interfere in the fundamental components of its child's objects like Mesh Render, Objects visibility, or whatever reason that can cause the child to become invisible.

Solution 2:[2]

The scale of your parent object Map is 0 in the x axis. Changing it to 1 is likely to solve the problem.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Cardstdani
Solution 2