I've got Collisters in my tree and picked up the Joseph & Emily family on the way. Don't think they're connected to mine, but may be the ones you've picked up Len. These are the 81 - 01 census entries I had:

8 Drinkwater St, Douglas 1901 RG13/5303 f19 p30 sch198 ED9

Joseph Collister H m 45 Joiner IOM German, Language: English
Emily “ w m 43 Douglas English
Joseph son s 17 House painter’s apprentice, Douglas, Eng
John son s 15 Butcher’s apprentice Douglas, Eng
Eva dau 12 Douglas, Eng
Lillian dau 4 Douglas, Eng

8 Drinkwater Street 1891 RG12/468 f.32 p.23 sch.141

Joseph C. Collister H m 35 Joiner K.German
Emily w m 35 IOM, Douglas
Emily d 13 England
Thomas E. s 10 IOM, Douglas
Joseph E. s 7 IOM, Douglas
John C. s 5 IOM, Douglas
Eva d 2 IOM, Douglas

3 Drinkwater Street, Douglas 1881 RG11/5662 f.93 p.16 sch.85

Joseph Collister H m 25 Joiner Douglas
Emily w m 23 Douglas
Emily d 3 England, Pendleton?
Thomas E. s 3mo. Douglas
(sch.86 Thomas Cavendish & family at same address)