Why is there an heir (Matthew Crawly, Lady Mary or new baby) since no one has died in the family? Since Robert has been the master of the castle, why did they need to find an heir?
(edited by Anonymous 4576737456)
Robert is getting old and an heir is needed to take over after him. They wanted to induct Matthew into their society while Robert was still alive so that he would know what to do with Downton and how the society works. After Robert dies, the baby will become the new heir, and when he grows older, Downton will become his responsibility.