Ah I have found the family in 1891,it is looking like Ernest was born an Andrews,not an Osborne.
At 78 Coolinge Road,Folkestone.
Arthur W Osborne 26 head ,platelayer on South Eastern Railway b Sussex
Fanny Osborne 27 wife b Sneeth? Kent
Edith Osborne dau b Folkestone.
Ernest Andrews 10 brother in law b Mersham Kent
Edith Andrews 13 sis in Law b Sneeth?
Anne Tribe 17 servant b Folkestone
Ellen Daniels 54 married boarder b Dover
Bertha E Andrews 23 boarder single living on own means b Bidborough
Mary Louis Andrews 25 Ditto ditto
Fanny Vanstraweza 60 boarder widow Ditto ditto b France
Oh Groom you type faster than me 
Exactly what I thought is Ernest brother to Fanny?