I started looking for you and then I got confused. You mention Charles and Tilda Christensen with Tilda born in Iowa but with no luck finding. See the subject of the email is Ingebretson I then looked for Charles and Tilda Ingebretson and found a Tilda but she was born in Minnesota not Iowa. So now am not sure which surname you are looking for. Perhaps more info such as birth dates, etc. would help in finding more about them.