Bonnie (1986, Oscar and Daisy)
who leads the troop with younger son Elvis (she still carries him sometimes even though he's an adult) (2002, Bonnie and unknown)
and her other son Phil (on the left) (1996, Bonnie and Oscar)
Grant, her brother but born at the same time as Phil (1996, Emma and Oscar)
According to the 2014 studbook (assuming that is right) Bonnie, Grant and Phil were all sired by loan chimp Oscar from Twycross who died in 1999 (also fathering Niki / Nikki, 1984, who was the dominant male who died in 2023).
Then Koko, unrelated, one of the oldest Chimps in Europe (born 1973 Dudley to Cherry and Pepe, arrived Whipsnade 2006). Koko arrived with a chimp called Jonnie, they both escaped from the enclosure in 2007, she returned but he was shot.