Going back to your Joshua, father of Sarah Agnes.... Sarah gives dad as Blacksmith on marriage..
There is also a Lilian McDonald who names dad as Joshua, blacksmith, at her marriage in 1919
Lilian McDonald, 192 Huskisson Street
Birth Year: abt 1898
Age: 21
Marriage Date: 25 Jun 1919
Parish: Liverpool St Saviour
Spouse's Name: Willard Kay Michael, soldier U.S Army residence 82 Lower Leeson? St, Dublin
Father's Name: Joshua McDonald, deceased, Blacksmith
Spouse Father's Name George Washington Michael, Farmer
witnesses Emily Williams and Harold Simpson
Sarah Agnes McDonald, Gt George Square
Birth Year: abt 1891
Age: 21
Marriage Date: 4 Mar 1912
Parish: Liverpool St Nicholas
Spouse's Name: Gustar Adolph Olsen, Interpretor, Gt George Square
Father's Name: Joshua McDonald, Blacksmith
Spouse Father's Name Anton Hegbert Olsen, shoemaker
witnesses John and Lillian Martin
Perhaps Lilian is Lizzie age 4 in 1901
