Unmarried parents entitled to visa?

I am asking this question on behalf of my sister.

She has been provisionally accepted for a teaching position in Brunei. She will be taking her 2 year old son with her but is concerned that as she was unmarried at the time of his birth and remains unmarried this might be an issue with granting of visas.
Can anybody advise whether this will be an issue?

Thanks in advance.

James.

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