▁also ▁has ▁two ▁half ▁sib lings , ▁T iff any , ▁from ▁his ▁father ' s ▁marriage ▁to ▁Mar la ▁Map les , ▁and ▁Bar ron , ▁from ▁his ▁father ' s ▁current ▁marriage ▁to ▁Mel ania ▁Trump . ▁Through ▁his ▁father , ▁Trump ▁Jr . ▁is ▁a ▁grand son ▁of ▁Fred ▁Trump ▁and ▁great - grand son ▁of ▁Elizabeth ▁Trump , ▁who ▁founded ▁what ▁became ▁the ▁Trump ▁Organ ization . ▁As ▁a ▁boy , ▁Trump ▁Jr . ▁found ▁a ▁role ▁model ▁in ▁his ▁mat ernal ▁grand father , ▁Mil o š ▁Zel ní č ek , ▁who ▁had ▁a ▁home ▁near ▁Prag ue , ▁where ▁he ▁spent ▁sum mers ▁camp ing , ▁fish ing , ▁hunting ▁and ▁learning ▁the ▁Czech ▁language . ▁ ▁Trump ' s ▁parents ▁divor ced ▁when ▁he ▁was ▁ 1 3 ▁years ▁old . ▁His ▁mother ▁told ▁him ▁his ▁father ▁was ▁having ▁an ▁extr amar ital ▁affair . ▁Trump ▁was ▁est r anged ▁from ▁his ▁father ▁for ▁one ▁year ▁after ▁the ▁divor ce , ▁fur ious ▁at ▁his ▁actions ▁which ▁broke ▁up ▁the ▁family . ▁ ▁Trump ▁Jr . ▁was ▁educated ▁at ▁Buck ley ▁School ▁and ▁the ▁Hill ▁School , ▁a ▁college ▁prepar atory ▁board ing ▁school ▁in ▁P ott st own , ▁Pennsylvania , ▁followed ▁by ▁the ▁University ▁of ▁Pennsylvania ' s ▁Wh art on ▁School , ▁where ▁he ▁graduated ▁in ▁ 2 0 0 0 ▁with ▁a ▁B . S . ▁in ▁Econom ics . ▁ ▁Career ▁After ▁gradu ating ▁from ▁P enn ▁in ▁ 2