How to get Tree Node ordinal position respect to its immediate parent

[Sudip_inn]

suppose i have a Tree Node say Node 1 and Node1 has one node Node2 and Node2 has 3 child Node called Child1,Child2 and Child3.

now i want to create a function where i will send immediate parent node and child node. function return the ordinal position of child node respect to its immediate parent.

say i will pass Node2 as immediate parent node and will pass child2. so function should return 2 because child2 is second child of Node 2.

how to create that kind of function?

thanks

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