A marriage certificate always helps, so good advice.
My advice is throw the 1877 birth certificate in the bin
Alfred,
If this is wrong I can dump it, but it something for you to look at and consider. Give or take a year on the dates.
Grace Lahey, Bn 1915, married Alfred D Corn,
Grace's parents,
George Lahey, bn 1866, Zola Johns, bn, 1882, married 1912.
Zola's parents, John D Johns, Mary L Morgan.
Previously to marrying Zola, George was married to Artie Hoothorn, they had a son, John Paul Lahey, bn, 1898, this son is living with his grandparents, 1910 US Fed Census. The grandfather on that census is the John Paul Lahey mentioned as father on George Lahey's death record on LDS.
George and Zola are buried at Sunset Hill Cemetery, hopefully side by side, can you confirm that?
Returning to George's parents and siblings, removing transcription errors from previous posting of records,
John Paul Lahey
Margaret
Sarah Jane, 1862
George, 1866
Louisa, 1872, went through life known as Lula.
Agnes 1881