A lord of a manor is dying and plans to leave his manor and fortune to a goat, who is a demon in disguise. I'm wondering how can I make this idea feasible. Being a demon, the goat could influence the lord into bequeathing his lands to him. However the lord's family and distant family wouldn't agree. I know there are people today who leave vasts amount of money to animals so that they are looked after but I'm not sure how this would work in a medieval setting, whether someone could act as the lord on the goat's behalf.
For the goat demon's motivations. The land the property sits on and surrounding areas used to be the habitat of his brethren so he wants to take it back. Also he wants the land so he can do goat demon things such as eating grass, sacrificing people etc.
It's tricky since he wants to keep the manor and the people (servants, workers etc) around, he just needs the top of the hierarchy changing. It's difficult to imagine people willingly working for a goat. Can you help me?
Magic and supernatural elements exist in this world albeit not very well known by the populace.