london britain prince william wife kate expect third child office say monday duchess force cancel engagement due severe morning sickness britain monarchy ride wave public support recent years due popularity william kate william brother harry news soon make headline around world queen elizabeth 91 say delight baby fifth line british throne grandfather prince charles father william elder siblings george charlotte 2. popular harry become sixth line throne royal highnesses duke duchess cambridge please announce duchess cambridge expect third child kensington palace say queen members families delight news couple say baby due kate william marry lavish ceremony 2011 watch two billion people around world two years late international camera crew photographers camp outside london hospital record birth george return two years late sister charlotte george charlotte since appear front cover magazines around world travel official royal tour poland germany parent george attend first day primary school late week fantastic news british prime minister theresa may say many congratulations duke duchess cambridge william harry headline recent weeks lead efforts remember mother princess diana die car crash paris 20 years ago last thursday sign young royals help modernize house windsor princes speak trauma death last emotional impact harry manchester visit center support people affect bomb ariana grande concert may give reaction fantastic great happy say kate last appear princes wednesday visit public garden kensington palace dedicate diana palace say would attend engagement children center monday due ill health previous two pregnancies duchess suffer hyperemesis gravidarum .... palace say duchess care kensington palace hyperemesis gravidarum cause severe nausea vomit require supplementary hydration nutrients condition force kate admit hospital early months first pregnancy george couple return live kensington palace early spell norfolk eastern england enable dedicate time royal duties behalf william grandmother queen william also give job air ambulance helicopter pilot one three kate prompt speculation early year want third child present cuddly toy design newborns trip tell william baby britain 's prince william wife kate expect third child