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Hop Pop is overprotective of his grandson and considers him to not be responsible enough, an opinion that drives Sprig to prove him wrong. He and Sprig go fishing every year as shown in the episode "Family Fishing Trip".
Hop Pop is overprotective of his granddaughter, though he still thinks she's much more responsible than Sprig. He does, however, prevent her from going out on her own because she's not old enough yet while letting Sprig and Anne do dangerous things there.