Thank you for the information. I do not believe the death information on Agnes Hamilton is the one I'm looking for as my Agnes Hamilton died about 2 years before Ellen and Donald MacMillan, which would make it about 1958. Also, the name of Agnes' husband was Hugh, and he died on January 11, 1898.
I found obituaries in the Motherwell Times recording Donald MacMillan's death at age 79 on December 4 1960. His year of birth would be about 1881. His wife, Ellen MacMillan, died 8 days later. The obituary records her death on December 12, 1960 and living at 8 Cassels Street, Motherwell.
I have a letter from James Hamilton in which he states his wife, Minnie, died November 1, 1963 and they were married August 8, 1930. In 1966 he was living at 8 Cassels Street, Motherwell, with David MacMillan (son of Ellen and Donald) and his daughter, Barbara.
I have found several newspaper records of Agnes Hamilton going back to 1909 but cannot find a record of her death. James Hamilton was her third son and was born February 1, 1894. He lived in Aberdeen in the 1930's and was president of the Torry Bowling Club. He and Minnie moved to Perth in 1942. I have not been able to find any death record for either James or Minnie.
Thanks again for your assistance.