Ancester married in Hamburg

Hi

Im looking for a brother or halfbrother to my mother. His name is Fritz
Ivar Bertil Persson and he was born 27/9 1920 in Billinge Sweden. He
married Wilma Johanna Rammin 23/7 1957. Wilma was born 8/9 1930 in Hamburg.

I hope someone can help me or maybe give some advice how to search for
this persons. My mother search her whole life after her siblings and
she only found one of five. So now i have pickt up the tourch.

Any info is werry appreciated

/ Hans