I have some ideas
1._ Jean is Clement grantson
1.1: Jean boos know about the hotel and want the customers to come
1.2: Jean is named after his grandfather brother Jean Marin
1.3: the family of Clement work white wine, (asterion mentioned that Jean Marin say that his wine was better than the hotel's wine
2._ the peacock is grandson of one of the workers that left their passport
2.1: the feather in the basement are of his grandfather
2.2 he say that his grandfather know of the hotel
3._ Al last 4 of the 12 olimpians are whit asterion
3.1 ades is old commander of asterion even train together
3.2: Hermes allow communication whit the real world even to asterion
3.3 I believe that is Dionisio the one that grant the healing wine to asterion forbidding Argos to drink it
3.4 the hoses of hearth (I don't remember her name) her Shire empowered the hotel ( asterion shelter)
I know my English isn't the best, sorry for that