Possible marriage for Frederick, son on John and Mary, as per 1901:
1911:
https://www.familysearch.org/ark:/61903/1:1:X7YN-NGZMarriage:
Dec 1908 Sheffield 9c 1017
RICE Frederick
DOBSON Daisy
Deaths:
RICE, FREDERICK 45
GRO Reference: 1929 D Quarter in GRIMSBY Volume 07A Page 705
RICE, DAISY MARIA 65
GRO Reference: 1947 M Quarter in GRIMSBY Volume 03B Page 298
Children:
RICE, JOHN mmn DOBSON
GRO Reference: 1912 S Quarter in GRIMSBY Volume 07A Page 1178
RICE, FREDERICK THOMAS mmn DOBSON
GRO Reference: 1916 M Quarter in GRIMSBY Volume 07A Page 1016
Deaths of Martha and Frederick STIFF:
STIFF, MARTHA 69
GRO Reference: 1929 M Quarter in GRIMSBY Volume 07A Page 1150
STIFF, FREDERICK ARTHUR 73
GRO Reference: 1932 J Quarter in GRIMSBY Volume 07A Page 671
Jamjar