Found the following information on this family:
Wisconsin Birth Index: Howard Courtney Robinson b: 12-1-1893 Lincoln Co., WI
1905 Census: Tomahawk, Lincoln Co. WI
Robert Robinson 40 Canada
Rosina Robinson 39 Michigan
Claude Robinson 13 WI
Howard Robinson 11 WI
Ethel Robinson 9 WI
1910 Vano, Kit Carson, Colorado Same family with child Frances Robinson age 8
1920 Denver, Denver Co.. Colorado
Howard C. Robinson Single Stationary Fireman
1930 Englewood, Arapahoe Colorado
Howard Robinson age 36 Barber shop
Stella Robinson age 38 Sales lady dry goods.
SSDI: Howard C. Robinson b: 12/1/1893 d: 3/1975 Denver Colorado
Colorado would be the place to check for information on any children for Howard & Stella. I checked the 1940 census for the same area as 1930 didn't find them, will have to wait until it is indexed to see if they can be found.
Hope this will assist you in your search.