@Zoo adventures, all of the hippos in Canada except Granby's Polita descend from Toronto or Granby lines, most both.
Petal, Perky and their late brother Samson were all from Granby's original pair, Patriarche and Sirene. Delilah could have been their sister too. There were 5 other brothers and a sister. One brother lived in Vancouver his whole life. Their sister Cindy lives in Philly. So that's 9 of the 17 for Granby.
Calgary's Sparky was born to Toronto's Flagstaff and Perky I. Her son Kiboko is Polita's mate and together they have had Kiboko II at Gulf Breeze, a female who died at about 6 months old, Hazen and Haben in Vancouver, Gladys and Bobo at Safari Niagara, Lobi in Calgary (who fun fact sired forbidden ill fated premature twin sons with his grandmother), and Coumba at Granby. That's another 8 bringing us up to the 17 you needed help accounting for.