Hi Darlene,
The only general source of Info I've got is the UK 1881 census. I've done a search for Hattie (and Harriet), but no luck, so I assume she wasn't born by 1881.
John Bull is a fairly common name, but I had a look at all those in the Isle of Wight that might be of a reasonable age to emigrate during the 1890s, as follows:
Dwelling: Park Street
Census Place: Whippingham, Hampshire, England
Source: FHL Film 1341287 PRO Ref RG11 Piece 1173 Folio 109 Page 3
Marr Age Sex Birthplace
John BULL M 26 M Whippingham, Isle of Wight, Hampshire, England
Rel: Head
Occ: Ag Lab
Sarah BULL M 30 F Loddiswell, Devon, England
Rel: Wife
Jessie BULL 6 m F East Cowes, Isle of Wight, Hampshire, England
Rel: Dau
Dwelling: Bembridge House
Census Place: Brading, Hampshire, England
Source: FHL Film 1341289 PRO Ref RG11 Piece 1183 Folio 71 Page 7
Marr Age Sex Birthplace
William BULL M 84 M Newchurch, Isle of Wight, Hampshire, England
Rel: Head
Occ: Pensioner Of Agricultural Society
Jane BULL M 82 F Brading, Isle of Wight, Hampshire, England
Rel: Wife
Edmund BULL M 59 M Newport, Isle of Wight, Hampshire, England
Rel: Son
Occ: Fishmonger
Ellen BULL M 58 F Newport, Isle of Wight, Hampshire, England
Rel: Daur In Law
John BULL U 24 M Brading, Isle of Wight, Hampshire, England
Rel: Grandson
Occ: Carriage Proprietor
Harry BULL 14 M Brading, Isle of Wight, Hampshire, England
Rel: Grandson
Dwelling: St Cross House
Census Place: Carisbrooke, Hampshire, England
Source: FHL Film 1341288 PRO Ref RG11 Piece 1177 Folio 4 Page 2
Marr Age Sex Birthplace
John BULL M 64 M Newport, Hampshire, England
Rel: Head
Occ: Miller Corn Merchant & Farmer
Jane Dashwood BULL M 50 F East Cowes, Hampshire, England
Rel: Wife
Occ: Wife Of Miller Corn Merchant & Farmer
Lucy BULL U 19 F Whippingham, Hampshire, England
Rel: Daur
Occ: Daur Of Miller Corn Merchant & Farmer
John BULL 13 M Carisbrooke, Hampshire, England
Rel: Son
Occ: Scholar
Howard BULL 9 M Carisbrooke, Hampshire, England
Rel: Son
Occ: Scholar
Edgar BULL 7 M Carisbrooke, Hampshire, England
Rel: Son
Occ: Scholar
Dwelling: 18 Crocker St
Census Place: Newport, Hampshire, England
Source: FHL Film 1341288 PRO Ref RG11 Piece 1175 Folio 76 Page 11
Marr Age Sex Birthplace
Edward BULL M 43 M Newport, Isle of Wight, Hampshire, England
Rel: Head
Occ: Baker
Elizabeth BULL M 34 F Newport, Isle of Wight, Hampshire, England
Rel: Wife
Occ: Dressmaker
William T. BULL 10 M Newport, Isle of Wight, Hampshire, England
Rel: Son
Occ: Scholar
Edward BULL 9 M Newport, Isle of Wight, Hampshire, England
Rel: Son
Occ: Scholar
Mary E. BULL 6 F Newport, Isle of Wight, Hampshire, England
Rel: Dau
Occ: Scholar
John BULL 4 M Newport, Isle of Wight, Hampshire, England
Rel: Son
Occ: Scholar
Frank BULL 2 M Newport, Isle of Wight, Hampshire, England
Rel: Son
Elizabeth BULL 2 m F Newport, Isle of Wight, Hampshire, England
Rel: Dau
Hannah TOOLEY W 66 F Newport, Isle of Wight, Hampshire, England
Rel: Mother
Occ: Nurse
James W. MCKENZIE M 45 M (N B), Edinburgh, Scotland
Rel: Lodger
Occ: Brewers Clerk Unemployed
Dwelling: 6 Broadway Cotgs
Census Place: Brading, Hampshire, England
Source: FHL Film 1341289 PRO Ref RG11 Piece 1183 Folio 30 Page 12
Marr Age Sex Birthplace
Henry BULL M 35 M Brading, Isle of Wight, Hampshire, England
Rel: Head
Occ: Farm Labr
Jane BULL M 28 F Sandown, Isle of Wight, Hampshire, England
Rel: Wife
Occ: Laundress
Frances M. BULL 9 F Sandown, Isle of Wight, Hampshire, England
Rel: Daur
M.Grace BULL 7 F Sandown, Isle of Wight, Hampshire, England
Rel: Daur
Annie M. BULL 5 F Sandown, Isle of Wight, Hampshire, England
Rel: Daur
Henry BULL 3 M Sandown, Isle of Wight, Hampshire, England
Rel: Son
John BULL 2 M Sandown, Isle of Wight, Hampshire, England
Rel: Son