I found Christina on the Social Security Death Index, although her last name was spelled slightly differently than you had mentioned.
Christina Shiels
Last Residence - Grand Rapids, Michigan
Born: 13 Mar 1892
Died: 12 Sep 1994
SS number issued in Michigan before 1951
Michigan Deaths:
Christina G. Shiels
Born 13 Mar 1892
Died 12 Sep 1994
Residence: Kentwood, Kent, Michigan
Place of Death: Grand Rapids, Kent, Michigan
She and William are also listed as Shiels (no d) in the 1930 Census. They are in Grand Rapids at 407 Quimby. The census says that they immigrated in 1925 and William had filed papers for naturalization. They are with their children, all born in Scotland: David, age 11 ; Isabella, age 10;
(*) , age 9; and
(*) , age 7. In the census, William is age 56 and was age 45 at his first marriage. Christina was age 38 and was age 21 at her first marriage, so it sounds like she was married before.
I found a border crossing from Canada to US for Christina and the children from July 1925. Their last permanent residence was Methil, Scotland. Christina's father was John Gage, 12 Swinton Blgs., Methil. They were headed to Grand Rapids to join William at 342 Brown St. All the children were born at Kirkcaldy and Christina was born Helensbur. They all had fair hair and complexions and blue eyes. Christina had mole on her upper lip. They traveled on the ship SS Montnairn from Glasgow to Quebec.
William was on the SS Athenia from Glasgow to Quebec, arriving 1 Jul 1923. He was age 50, a carting contractor, last permanent residence - Kirkcaldy, wife Mrs. Catherine Shiels in Thornton, Fife, Scotland. He was headed to Grand Rapids to join brother Timothy Shiels, 1413 Buffalo Ave. He was 5 ft. 5 inches tall with a fresh complexion, fair hair, and blue eyes. He was born in Kirkcaldy.
I also found William and Christina on a passenger list for the SS Queen Elizabeth from Southampton to New York on 27 May 1948. They were US citizens. William was age 75, naturalized in District Court of Michigan 13 Mar. 1942. He lived at 407 Quimby St., Grand Rapids. Christina was age 56.
On the Michigan Deaths database:
David Shiels
Born 24 Sep 1918
Died 17 Mar 1986 in Grand Rapids
Residence - Grand Rapids
Isabella Shiels
Born 2 Mar 1920
Died 5 Feb 1979 in Grand Rapids
Residence - Grand Rapids
I think I may have found information on one of the other children, who may still be living, so let me know if you'd like that & I'll send you a private message.
If you go here and search under West Michigan Newspapers for Shiels, there are a bunch of results:
http://data.wmgs.org/ (*) Moderator Comment:
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