This appears to be the couple migrating to the USA-
Travel & Migration section
Britain: outbound passenger lists leaving UK 1890-1960 - person transcript Print Close Name: John R WEIR Date of departure: 18 March 1908 Port of departure: Queenstown Destination port: New York Destination country: USA Date of Birth: 1882 (calculated from age) Age: 26 Marital Status: Married Sex: Male Occupation: Dentist Notes: Passenger recorded on: Page 2 of 5 The following people are potential travelling companions from your search: - Kathleen WEIR
Correspondingly, they appear in the Ellis Island Arrivals Records-
The Scanned IMAGE gives the Irish Addresses of the respective fathers.
This appears to be the later Marriage on Find My Past-
Civil Registration event: Marriage Print Close Name: WEIR,John Registration district: Bucklow County: Cheshire Year of registration: 1909 Quarter of registration: Apr-May-Jun Spouse's last name: Not available before 1912 Volume no: 8A Page no: 454 MarriageFinder:John Weir married one of the following people:
I wonder why BUCKLOW CHESHIRE. Liverpool or London seem more likely, given the circumstances.
Also the age difference in the Census below.
1911 census transcription details for:20 Seymour St Somers Town N W Print Close National Archive Reference: RG14PN740 RG78PN25 RD9 SD3 ED29 SN329 Reg. District: St Pancras Sub District: East St Pancras Parish: St Pancras Enum. District: 29 Address: 20 Seymour St Somers Town N W County: London
Name Relation Condition/ Yrs married Sex Age Birth Year OccupationWhere Born WEBSTER, George Head MarriedM 45 1866 Boarding House Keeper Marston Sheffordshire WEBSTER, Sarah Wife MarriedF 30 1881 Assisting In The Bussines Celia St Liverpool FARTHING, Sarah Domestic Servant WidowF 58 1853 Domestic Servt Pultney St London LACY, John Boarder MarriedM 30 1881 Pensioner Ballacolla Ireland WEIR, John Boarder MarriedM 30 1881 Dentist Dublin Ireland WEIR, Sarah Boarder MarriedF 40 1871Dublin Ireland DENHARDT, James Boarder MarriedM 48 1863 Chef Paris France ELLIS, Leonard Boarder MarriedM 32 1879 Professional Theorothical Chatham Kent