Yes, indeed they are a tough bunch to follow! I did a little search on all of them, and all I got back was just a few bits.
1870 Chicago IL Ward 5 pg 225
Wm McGregor 27 born ONT carpenter/builder
Helen McGregor 23 born ONT
they were married Sept 1869
1930 Meadow Point WA dist 325 pg 8A
Orrin Lohman 40 born MI real estate broker
Lillian Lohman 39 born OK (not Omaha)
Eva Lohman 17 born WA
Lyle Lohman 13 born WA
Orrin and Lillian were married when they were both 20.
Washington index lists a Lillian Lohman aged 61, died 27 Nov 1951, last residence AL