Help with vertex position of parent object

I have two objects. One of them is parent, another one is its child. I want to get vertex position of parent object. I use the following script, which is assigned to child object, to get the position of parent first vertex in axis X.

     Vector3[] vertices = transform.parent.GetComponent<MeshFilter>().mesh.vertices;
     var gPos = transform.TransformPoint(vertices[0]);
     print("Parent vertex at " + gPos.x);

Another script is assigned to parent and performs the same function

     Vector3[] vertices = GetComponent<MeshFilter>().mesh.vertices;
     var gPos = transform.TransformPoint(vertices[0]);
     print("Parent vertex at " + gPos.x);

But issue is that i have different numbers. For example, first script shows -5, second one -3. I know that this is somehow related to the position of child object relative to its parent, because the chilld object location in axis X is 2. It pluses this number and i get those results.

Can somebody help me to understand why i get different positions. Thank you.