Is this the only info you have on this person? If so you would first have to establish what church he (the father) was working with and see if they have their old records. From there you can hopefully dicipher if he (the father) stayed or if he was reassigned to another ministry and for how long, you would need to figure out if he was moved around alot and where he ended up. If he left when the kids were small they would most likely have gone with him, then you would have to search records from the place he went to. Courthouses, churches, census records are all good sources of info. The mormons keep really good I mean REALLY good geneology records. You might be able to do a search there. I did a successful search for my birthfamily about 5 years ago so I know a little about this stuff :-) Good Luck!