you can get information from the births deaths extracts ofice in singpaore. If your aunt was born here, it will be made easier if she had what they call an IC number, baically the number which is on her passport. you can extract information from the on line services.
i can give this to you, as i am also trying to find my mothers family James. she had sistes there and her father was Francis james.Her name was:
Theresa James born 18 jan 1930 . she had kids here and was married to a Augustus John.