Hi, reference your query. Glad you have your family membership card and certainly shouldn't pose a problem with your mum (I take it you live at home?). Usually a 'Family' membership would be two adults and their children under 16 but I guess if you ARE a young adult still living at home should be no problems.
As far as form are concerned, they are only for members wishing to book tables.
Hope you have a good day - see you there?