In 1930, Norman was living with his grandmother, Martha Freeman (age 71), in Preble County, Ohio. So, I would assume that Louise was a Freeman.
Norman was born July 31, 1917. SS# 289-05-0322. He was living in Kentucky at the time of his death. (I have had great success getting death certificates from the state of Kentucky, this would verify that Albert/Alvin and Louise were his parents and, if indeed, Louise was a Freeman). Norman died in December of 1978. He was married to Margaret Louise xxxxx. Her last maiden name was either Warden or Kellam. She passed away in 2003 and I have her obit but won't post it here since it has info on living individuals, but I can send it to you if you contact me via e-mail. You should be able to contact Norman's son if you are interested.
Louise (Louice) died in Butler County, Ohio on Dec 4, 1919. Again you can send for her death certificate to get the names of her parents.
Albert died in Butler County, Ohio on May 5, 1926. Im not sure if this is Albert Sr. or the Albert(Jr.) that appears in the 1920 census listed as the brother of Marshall. Again you can send for the death certificate if you like.
Marshall Sr. died on November 3, 1972 in Butler County, Ohio. Death Certificate # 083668 Vol # 21071.
Marshall's second wife, Edna M., was born January 30, 1898 and died June 14, 1975 in Butler County, Ohio.
Orville John Agnew was born November 2, 1929 and died April 20, 2000. He was a navy vet. His mother was a Lundsford. I believe you already thought that Elizabeth was a Lundsford.
I still could not find Marshall Jr. in the 1930 census.
Well, now you have tons of info to get you started. I would be happy to help if you get any additional info. Contact me via email if you want Norman's wifes obit. I can also direct you how to send for death certificates in Ohio and kentucky if you are interested.