Ummmmm what about an heir? ┐(‘～`；)┌

Just wondering how they worked out making royal gaybies in the olden days before artificial insemination. ｢(ﾟﾍﾟ)
... if grapes can grow on trees then maybe there's a legend about magical mpreg -- only for royal gay sex that ocurrs under the shiny tree?? Maybe also under a full moon... ε=ε=(ノ≧∇≦)ノ
Not sure why I had that random thought...I suppose royal lineages would just get passed along to the next heir in line like a cousin or brother.