searching, Edgar, Kimberly, Robin Anderson and family

Hello,
i am searching for a family.my 2 sisters(Margaret and Rieta) fathers name was Edgar ? Andersonhe was married to my mother Rose, in the 70's.Edgar had 2 children from another marriage their names are Kimberly Dawn and Robin Lee i do not know how old these 2 are. my mother and Edgar also had another child that died when he was 17 days old his name was Anton or Antone (i am not sure of the spelling) he was buried in Roselawn cem in MN.i have a death notice from the paper that also says Edgar's parents were Mr and Mrs Russell Anderson of Twin Lake, MI.I am writing this on my sisters behalf if anyone has any info please contact me at [email protected] . iam searching for anything on this family. thank you
amy