I am looking for information on the Derrig family who immigrated from Ireland to Canada around 1840's and then settled in Chicago. Father's name was John Derrig, mother's was Catherine Collins. They had 5 children: John J., Anna, James, Martin and Michael. Can only find record of 3 of the children (John, Anna and James) plus Catherine settling in Chicago. Any help in tracing earlier generations in Ireland or Canada would be appreciated.