Hi Ruth! See if this helps. Looks like they didn't have any biological children. He's listed as an old field worker in all...
1930 Arthur C Adams 45 Clara B Adams 40 Re: Clara Home in 1930: Precinct 4, Harris, Texas Age: 40 Estimated Birth Year: abt 1890 Birthplace: Illinois Relation to Head of House: Wife Father's Birthlace: Pennsylvania Mother's BirthplaceL Illinois
1920 Charles A Adams 35head Clara B Adams 30wife Fay E Adams 6niece
Re: Clara B Adams Home in 1920: Justice Precinct 4, Harris, Texas Age: 30 years Estimated Birth Year: abt 1890 Birthplace: Illinois Father's Birth Place: Illinois Mother's Birth Place: Illinois Marital Status: Married Race: White
Can't find them in 1910, but she's listed as next of kin in his WWI draft registration and they are living in Humble, TX.