Pandu, my father, and Dhritarashtra were born as a result, and they were considered to be Kshatriyas. Vidura, who was fathered by Vedavyasa at the same time, is considered to be a Shudra because his mother was a servant. And look at us, the five Pandava brothers. We are all born of gods. Yet we are considered to be Kshatriyas.
Birth can determine the caste only if there is no mixing up amongst the castes.
When the castes are mixed up, as it has been happening for so long now, birth alone cannot decide the caste of a person. Thus I am convinced that it is not birth that determines the caste to which one belongs, but it is the character that decides. In my opinion, it is the holy Gayatri who is the true mother of a Brahmin, and the teacher who is the true father. Thus that person is a real Brahmin who has studied the Vedas, whose character is without blemishes, who strives to realise the Brahman, the supreme entity. The conversation between the two continues a bit longer.