Post 1871 I think things get rather complicated. I spent a while yesterday looking at a Hugh Edwards with a birthplace also listed as 1839 at Greenfield, Flintshire who was living in Birkenhead in 1881-1911 and also in the 1881 recorded on a vessel. I think that this is the same Hugh you have in 1861/71 with wife Elizabeth nee Jones
I think by 1873 Elizabeth had died and Hugh remarried a widow Mary Sharpe nee Magee in Birkenhead 17 Jan 1873 with Hugh listed as a widower and Mariner age 32 with father Evan Edwards. They have two children then by 1881 Hugh's second wife had died and Hugh is living with a third partner with name Ann as below in Birkenhead
Hugh Edwards 43 Flatman b Greenfield, Flintshire
Ann Edwards 38
Hugh Edwards 8
Thomas Edwards 6
Charles Edwards 2
William John Edwards
Thomas Eaton 12 Stepson
Mary Ann Eaton 9 Stepdaughter
Samuel Henry Eaton 6 Stepson
Do you have access to Anc? This tree lists the family roughly in 1881 and beyond
http://www.rootschat.com/links/01tze/I can't see a definate birth for George or him in 1881 but in later census years he appears to have been a sailor
Hope this makes sense and sorry it is complicated

Kay