Kaia, Maria, Arne Langberg and parents Emigration

My great grandmother Kaia Langberg came to Iowa and married the brother of her sister's husband, Arne Rensmon, my great grandfather was Martin Pedersen Reinsmoen from Sorkness Grue Hedmark. I would like to learn if the parents of the Langbergs also emigrated, probably around 1900. I have found records for my great grandmother and her siblings but not the parents departure.