edits and additional info courtesy of FAG member Tritt Girl, # 47486837:

Son of Charles Henry Elderkin & Amelia Jane Elderkin-Elderkin (yes, maiden & married names are the same)

living in Seekonk, Mass., in 1940 federal census:
Household Role Gender Age Birthplace
Leonard Elderkin Head M 48 Massachusetts
Ada Elderkin Wife F 43 Rhode Island
Hazel Elderkin Daughter F 20 Massachusetts
Helen Elderkin Daughter F 16 Massachusetts
Leonard Elderkin Son M 5 Massachusetts
Jean Elderkin Daughter F 3 Massachusetts

living in Seekonk in 1930:
Household Role Gender Age Birthplace
Leonard A Elderkin Head M 38 Massachusetts
Ada Elderkin Wife F 33 Rhode Island
Hazel Elderkin Daughter F 10 Massachusetts
Helen Elderkin Daughter F 6 Massachusetts

living in Seekonk in 1910:
Household Role Gender Age Birthplace
Chas H Elderkin Head M 52 Massachusetts
Amelia J Elderkin Wife F 48 Massachusetts
James E Elderkin Son M 23 Massachusetts
Mabel Elderkin Daughter F 26 Massachusetts
W Archie Elderkin Son M 19 Massachusetts
Leonard A Elderkin Son M 17 Massachusetts
Walter E Elderkin Son M 16 Massachusetts
Winifred A Elderkin Daughter F 14 Massachusetts
Edna L Elderkin Daughter F 13 Massachusetts
Geo E Elderkin Son M 9 Massachusetts
Arthur Elderkin Son M 7 Massachusetts
Chas F Elderkin Son M 3 Massachusetts
Bernard E Lincoln Son-in-law M 30 Rhode Island
Amelia Lincoln Granddaughter F 4 Rhode Island
M Francis Lincoln Granddaughter F 3 Massachusetts
Alice L Lincoln Granddaughter F 1 Massachusetts

living in Seekonk in 1900:
Household Role Gender Age Birthplace
Charles H Elderkin Head M 40 Massachusetts
Amelia J Elderkin Wife F 35 Massachusetts
Maud Elderkin Daughter F 16 Massachusetts
Mabel Elderkin Daughter F 15 Massachusetts
James Elderkin Son M 13 Massachusetts
Marietta Elderkin Daughter F 12 Massachusetts
William Elderkin Son M 10 Massachusetts
Leonard Elderkin Son M 8 Massachusetts
Walter E Elderkin Son M 7 Massachusetts
Winnifred Elderkin Daughter F 4 Massachusetts
Edna Elderkin Daughter F 2 Massachusetts
George Elderkin Son M 0 Massachusetts