Using variable or using direct method call

If I were to do this:

public void method() {
    Container parent = getParent();

    :::
    :::

    :::

    parent.callMethod(...);

    :::
    :::

    :::
    :::

    parent.callAnotherMethod(...);


    :::
    :::
}


and if another thread were to change the parent, will the above fail since the method is not synchronized?

Or should I just leave it that way rather than change it to getParent().callMethod(...) everytime...but doing so is of no use since if the parent changes midway, the method's objective will not be met since it requires that the parent be the same throughout the method's scope?
.

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