Hello,
On the 1891 there is a Florence E Annis, 21, dau, b. Devonport, living with parents and siblings in Devonport.
1891 a possibility for John:
John G Sellers, head, 30, Gardener-Domestic Servant, b. Colyford ? Devon
Emma Sellers, wife, 30, b. Seabrough? Somerset
Katie, dau, 2, b. Seaton, Devon
Living in Seaton and Beer, Devon.
Not sure if this helps.
Regards
Jonathan