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Found one definition

1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
   令息 /(en)tʃˈaɪniːz(ja)lˈe̞tə (en)tʃˈaɪniːz(ja)lˈe̞tə/, れいそく /ɽˌe̞isˈo̞kɯᵝ/
   (noun (common) (futsuumeishi))
            Note: honorific or respectful (sonkeigo) languageson