Unfortunately the wife has passed away by 1930 - so no more clues.
1930 Census Kansas City, Jackson, MissouriRobert B Greaves 51 Born England. Immigrated 1909. No Occupation. Naturalization applied for.
Ethel Greaves 14 Born Missouri
Mary Greaves 13 Born Missouri
Katherine Mullaney 27 Step-Daughter
Marie Mullaney 31 Step-Daughter