Carl Gustav Rehnskiöld's brother-in-law Anders Appelman later came to participate more actively in the upbringing of the five siblings, and gave funds to Carl Gustav's and his brothers' continued education.
Carl Gustaf Rehnskiölds svåger Anders Appelman kom senare att delta mer aktivt i syskonens omvårdnad och bidrog med penningmedel till Carl Gustafs och hans bröders fortsatta utbildning.