I have them in the same town in 1870, with John and Catherine living next door to them.
In Philip's household, they also have an Emma, who is 13 and born in Missouri, along with Rufus, 10, Charlie, 6, and a Willie, 9 months.
John J 37, Catherine is 35, and they have a son John L, 10. John Sr. is a farmer.
I did find John in the 1880 also, with Catherine, John L., 20, and Louisa F, 22, born Indiana, John L's wife. In other census records, I found her listed as Frances also. Very confusing.
In 1900, I have John and Catherine with Clara, 16, still in Missouri.
If I had to guess, Philip and Mary died between 1880 and 1900 (no 1890 census). But their children are still around. I did find Rufus and Charley.
Let me know if you need anything else.
Kath