finding relatives

Hi. I'm looking for relatives I may have in Heidelberg. My mother, Hildegard Becker left in the 50' but she had a brother and a sister, which she lost contact with in the 60's. Their names were Haans and Honey Lucie(spelling might be wrong) i'm sure they have passed by now but I may have cousin or second cousin that Id love to see when I come to Heidelberg. My mother's birth name is Becker and her father died in the war when she was quiet young. If any knows anything about the family, I'd appreciate any coresponse