This is all I can do for you as I don't have an Ancestry subscription. Dates are generally approximate as they tend to differ on each census. My added notes are in the square brackets.
Children of John Bissell and Emily Smith:
1. Harrie - female, age of 3 in the 1871 census [This name does not appear on any other census.]
https://familysearch.org/pal:/MM9.1.1/M4Q7 L64s
[May possibly be Florence.]
2. Florence (aka "Flora") - b. 16 Sep 1867, married Charles McGuire, b. 18 Dec 1867, 3 children
007184-88 (Lincoln) Charles MCGUIRE, 21, farmer, Louth, Niagara Twp, s/o Owen & Amanda MCGUIRE, married Flora BISSELL, 21, Niagara Twp, same, d/o John & Emily BISSELL, witn - James SMITH of California & Florence BALL of Niagara, 3 December 1888 at Niagara
http://canadianheadstones.com/on/view.php?id=117585http://automatedgenealogy.com/census/View.jsp?id=33826&h...3. Mary Ann (also in 1871 census, age 1 year) - born circa 1870, married (1886) William "Bill" Fellows
https://familysearch.org/pal:/MM9.3.1/TH 1951 24494 14155 37?cc=1927566&wc=M6VR YZ7:220999701,221017401,221017402,221040301 [Click on the + sign to enlarge. Fellows/Bissell marriage is second from the end.]
http://canadianheadstones.com/on/view.php?id=127136 [William's father and mother?]
http://www.canadianheadstones.com/on/view.php?id=1271314. Elizabeth - b. 10 Aug 1871, married (1889) James Gayder, 5 children, [This family can be found in the 1901 census for St. Catharines.]
7316-89 (Lincoln Co): James GAYDEN, [should be spelled "Gayder"] 22, farmer, England, Niagara twp., s/o William & Eliza, married Elizabeth BISELL, 20, Niagara twp., same, d/o John & Emily, witn: P.W. GUNN & Elen BISSELL, both of Niagara twp., 2 March 1889 at Niagara
http://automatedgenealogy.com/census/View.jsp?id=19517&h...5. William - born circa 1876, married twice [definitely to one McGuire sister, possibly to two, sisters of Charles McGuire who married Florence/Flora]
22533-23 William BISSELL, 49, farmer, widower, Niagara on the Lake, same, s/o John BISSELL (b. Canada) & Emily SMITH, married Catherine McGuire ROBINSON, 48, widow, Grantham twp., Niagara on the Lake, d/o Owen McGUIRE (b. Canada) & Amanda BROOKER, witn: Mrs. T. MUNRO of Stamford & Alice m. GREENFIELD of Niagara Falls, 8 May 1923 at Niagara Falls [William's 2nd marriage]
6. George - 1878-1968, married Margaret ?, 1889-1972 [He married later in life so may not have had children.]
https://canadianheadstones.com/on/view.php?id=1156237. Jessie May - 7 Oct 1881-16 Jan 1950, married Isaac Lavell 7 Nov 1880-21 July 1954
http://canadianheadstones.com/on/view.php?id=117932http://automatedgenealogy.com/census11/View.jsp?id=58187&... 8. Lavina or Lavinia (aka "Vina") - b.c. 1882 , married Artemus Hugh Boyden (born 1876, USA, served in US military, also in Canadian Expeditionary Force in WWI)
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=bo...;
http://automatedgenealogy.com/census11/View.jsp?id=58200&...