He was the grandfather of jewelry designers Grete Prytz Kittelsen and Jakob Tostrup Prytz, jr. He was also an uncle of Eiler Prytz who became a co-owner of "J. Tostrup".
He was the father of Jakob Tostrup Prytz and grandfather of Grete Prytz Kittelsen, as well as an uncle of Frederik and Eiler Prytz. The latter became a co-owner of "J. Tostrup".