If you want to find out about Thomas Boardman, then start by getting Christopher's marriage certificate, or birth certificate (£7) that way you are starting from a known point.
http://www.1837online.com/Trace2web/
Thereafter you may be able to find Thomas on 1901 Census here (the site can be busy)
http://www.censushelpdesk.co.uk/ which may tie in with the address on the Absent Voters entry on Accy Pals site.
If you know date of death then there may be a Will or Letters of Administration.