Gilbert/Wilson families

My great grandparents are from Enniskillen and later Dublin. I'm looking for help in finding info on my great great grandparents and their parents. I know my great grandmother Margaret Jane Wilson was born to Thomas Wilson and a Miss Brien and they had 7 children (I have their names but that is all) Miss Brien died when Margaret Jane was 8 and Thomas went on to marry a Jane Carrothers and they also had 7 children whose names I know (I have a tiny bit of info about one or two of these kids). I'd love to find out more about all of these children.

My great grandfather was William Gilbert. He and Margaret Jane had 2 sons and 3 daughters only my grandpa married and he had only one child. I'd love to know if I have any Gilbert surnamed relatives (other than my siblings) as I have not been able to find any. Below is some info I have about where these relatives lived and some info about being a 'freeman' of Dublin which I would like to understand.

In the 1901 Census this family was living at 17.1 Melfont Ave. Kingstown Dublin (1 block form Pierre Hotel)
In the 1911 Census they lived at 23 Townhall Street Enniskillen, Fermanagh.
On their marriage certificate it said that Willam had been living at 3 Victoria Terrace (Pierre Hotel) prior to wedding and Margaret had been living at 35 Townhall Street Enniskillen.

William Gilbert was made a free-man of the City of Dublin on 12th December 1900. (Seems to have to do with being related to Godfrey Moore who was admitted into the liberties and franchises of the city of Dublin by right of marriage at Michaelmas. Assembly 1837 City Hall Cork Hill signed William Ford Town Clerk Dec 18 1855)

Thanks for your help. I will post in Dublin forum too.