Have a look at
http://www.1911census.co.uk/in 1911 there is, in Spilsby:
Thomas Waite, b. 1846
and Emma Waite, b. 1849
who apparently in the same house as:
Marie Bowman, b. 1884
and Thomas D Bowman, b. 1903
In 1901 I find them as Waites:
Thomas Waites, 55, b. Ingoldmells, Grocer + Wine Merchant, Shopkeeper
Emma, 52, b. Lincoln
Henry C, 27, b. Spilsby
Marie, 17, b. Spilsby
Marie/Marian's marriage is shown at freebmd.rootsweb.com:
Marion Waite to Harry Alexander Bowman, Sep 1902 quarter, Boston district, Volume 7a page 885
The marriage certificate would probably be a good next bet - should confirm census details and some information about Harry/Henry that will help you figure out where he's disappeared to in 1911.