Are you still looking for Gjerstad's in Minnesota? Maybe you've gotten many responses but, if not, I have quite a bit of information on the same Gjerstad linage. Gustav was my great-grandfather, Ingvar was his son and my father's father. I don't see Ingvar in the list of children so maybe my great-grandfather was Gustav's son, Gustav. My grandfather Ingvar was born in 1899 and died in 1959. I'll check my documents.