Katter has three children: musician Thomas Katter, Niclas v. Bonsdorff, and Christofer v. Bonsdorff.
The song "Det finns så många sköna människor" ("There are so many wonderful people") arranged by Katter won the "Tenavatähti" children's song contest in 1991 and was performed by the 10 year old child star Christopher Romberg.
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Katter, whose native language is Swedish, is the son of Olympic bronze medalist Berndt Katter.
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