Della married James Francis McKay, son of Daniel McKay and Margaret O'Henrly, on 4 june 1932 in Detroit, Michigan. James was born 9 October 1892 in Fremont Township, Saginaw County, Michigan. He died 24 August 1991 in Tendercare, Mt. Pleasant, Michigan and was buried in Merrill Sacred Heart Catholic Cemetery, Merrill, Saginaw County, Michigan.
Della stayed home and kept house and took care of her mother who was in a wheel chair for many years. After both Della's parents passed away, she married James McKay in Detroit Michigan. Jim worked in Detroit for Briggs Body Works and they made their home there for a few years, until moving back to the Edward Miller Homestead. Della (Miller) McKay was a member of Merrill Sacred Heart Church and its Altar Society. She was a member of the Lakefield Quilting Group. Although she had no children of her own, she cared for and loved many children.