Right before a person is born, his/her identity starts building…It partly consists of the biological matter he inherits from his parents..
1. Biological Parents – Nature decides it
2. DNA inheritance from biological parents – Physical. Mental abilities…
3. Baby Birth-Certificate – First ID issued by the legal authorities..
4. Blood-Relations – Not our choice, we just get them..
5. Other Relations – We make them..our choices 
6. Friends – Gives sense of togetherness
7. Country – Culture/Values etc..
8. City - Gives sense of Extended Social network
9. Education – Shapes our Mental Faculties
10. Career – Gives sense of Achievement and Livelihood too
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And what is the true identity of a person … a mix of all these? What about the soul…? Does the passive not determine the active?
There is no eternal entity called a “soul”…its just consciousness that prevails in this universe..
Buddha has described that we have 6 layers, which define the “self”..
I can share some resources with you, if you interested