I believe this may be your family, thsi is the only HG Kilpatrick I find.
1880 Harvey County KS, Pleasant Twp. Dist 243, image 2 13/13 Hugh G. Kilpatrick34Farmer Sct. Ire. Ire. Anna S.30Keeping houseOH WVA PA Robert A.8b PA Mary J.7" Elizabeth5KS Agnes4" James L.1"
1900 harvey County Pleasant twp Dsit 90 image 6 48/48 Hugh KilpatrickDec 184556 Div. Sct Ire Ire imm 1865 in US 35 yrsFarmer James L.Feb 187921KS Samuel W.Jul 188019" Thomas A.Nov 188118" David E.Apr 188317"
1910 Same location Dsit 49, image 9 96/99James L. Kilpatrick31 mar8yrs, KS Scot VA. Martha30 mar8yrs, 2chb, 2liv, Eng Eng Eng Kernon C.7KS Mary B.3" David E. Brother26singleKS Hugh G.father65 wdSctFarmers
Did not see Hugh on the 1920 census , however son James and family were in Butler County.Hope this helps, Howard Boswell