I found Harry in the 1910+1920 and 1930 census + his children in the 1920 census. I think I found him in the 1900 census but birth dates didn't match. It's possible he remarried to a woman named Atheline/Athalane Streight who had a daur also named Atheline Streight. In 1920 census this Harry D.Covert and Athalane were living in Bronx Assembly District 8, Bronx, New York. His Occupation listed as Plumber.
=--= Name: Harry D Covert Home in 1920: Bronx Assembly District 8, Bronx, New York Age: 31 Estimated Birth Year: abt 1889 Birthplace: New York Relation to Head of House: Self (Head) [Head] Spouse's Name: Athalene Covert Father's Birth Place: New York Mother's Birth Place: New York Marital Status: Married Race: White Sex: Male Home owned: Rent Able to read: Yes Able to Write: Yes
Household Members: Name Age Harry D Covert 31 ..Occ: Plumber. Athalene Covert 35 Athalene A Covert 12
I found Atheline with her 2 yro daur in the 1910 census as follows=
Name: Atheline S Streight [Atheline A Straight] [Atheline S Morgan] Age in 1910: 25 Estimated Birth Year: 1885 Birthplace: New York Relation to Head of House: Daughter Father's name: Samuel H Morgan Father's Birth Place: New York Mother's name: Atheline A Morgan Mother's Birth Place: New York Home in 1910: Cuba, Allegany, New York Marital Status: Single Race: White Gender: Female
Household Members: Name Age Samuel H Morgan 69 Atheline A Morgan 64 Atheline S Streight 25 Atheline A Streight2. =-=-=-=-=-=-=-=-=-=-=-=-=-