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Hiram William Wolfe is Heffer's adoptive paternal grandfather from George's side of the family. While he is undoubtedly very old, his exact age is never revealed, he was said in his prime some time in the 1940s, according to the second-season episode Cruisin. This would put him somewhere around 80. His eyesight, co-ordination, and bladder control are all suffering, and he cannot chew solid food. He relies on his walking stick or wheelchair to get around. He has a hatred of wallabies and acts hostile towards Rocko, but due to his incredibly poor eyesight he mistakenly believes that Rocko is a beaver (despite that Heffer lied to him that Rocko is a coyote). He was also in love with Winfred Wolfe when he attended Ozark Tech. He was voiced by Charlie Adler.