athers ▁were ▁Ferdinand ▁Se ym our , ▁Earl ▁St . ▁Maur ▁( son ▁of ▁Edward ▁Se ym our , ▁ 1 2 th ▁Duke ▁of ▁Som erset ) ▁and ▁the ▁R t . ▁Hon . ▁George ▁Cav end ish - B entin ck ▁( grand son ▁of ▁William ▁Cav end ish - B entin ck , ▁ 3 rd ▁Duke ▁of ▁Port land ). ▁ ▁Lucy ' s ▁brothers , ▁Ferdinand ▁and ▁Victor , ▁were ▁the ▁ 8 th ▁and ▁ 9 th ▁Duke ▁of ▁Port land , ▁respectively . ▁ ▁T ogether , ▁Regin ald ▁and ▁Lucy ▁were ▁the ▁parents ▁of ▁one ▁child : ▁▁ ▁Joseph ▁Andrew ▁Christopher ▁Ho are ▁( 1 9 2 5 – 2 0 0 2 ), ▁the ▁former ▁chairman ▁of ▁Association ▁of ▁Char tered ▁& ▁Techn ical ▁Anal yst s . ▁He ▁married ▁Lady ▁Christ ina ▁Alice ▁Mc D onn ell , ▁a ▁daughter ▁of ▁Rand al ▁Mc D onn ell , ▁ 8 th ▁Earl ▁of ▁An trim ▁and ▁the ▁artist ▁Ang ela ▁Sy kes ▁of ▁Glen arm ▁Castle . ▁Among ▁her ▁brothers ▁was ▁Alexander ▁Mc D onn ell , ▁ 9 th ▁Earl ▁of ▁An trim ▁and ▁artist ▁H ector ▁Mc D onn ell . ▁ ▁He ▁lived ▁at ▁P ine ▁C rest ▁in ▁Haw ley ▁and ▁at ▁ 8 0 ▁Har ley ▁House ▁on ▁Mary le bone ▁Road ▁in ▁London . ▁ ▁Sir ▁Regin ald ▁died ▁in ▁London ▁on ▁ 1 2 ▁August ▁ 1 9 5 4 . ▁ ▁References ▁ ▁External ▁links