1900 Census has them living in Burlington with his daughter Minnie at 531 10th Street.

1910 Des Moines County, Iowa census taken for Burlington:
531 10th Street
Grant Phillips 46 IA KY KY
Harriet Phillips 38 IA IA IA married 15 years 1 child 1 living (from Grants first marriage to Minnie Packard Cowles)
Minnie Phillips 18 (Minnie Cowles Phillips born 15 October 1892)
Paul H. Phillips 38 IA KY KY
Mary Phillips 36 IA IA IA sister-in-law married 12 years 2 children 2 living
Paul S. Phillips 8 IA nephew
Helen Phillips 5 niece.

1920 Census: still living at 531 10th Avenue.
No one else living with them.

1930 Des Moines County, Iowa census taken for Burlington.
(ages for Harriet and Henry seem to be off)
Grant V. Phillips 65
Harriet Phillips 50
Henry Schramm 65 father-in-law
Ida H. Schramm 78 mother-in-law