Thank yo so much! : )
Technically, all the endings could be considered canon (parallel dimensions). However, if I were to make "A House for Alesa 3", it would probably follow the events of ending 7/9 with Alesa having lost her hearing (Alesa and Greta live together as a couple and Mr. Bob will sleep for 99 years)
The reason I'd choose that endings is because it allows me to put Mr. Bob to rest without killing him, and Greta and Alesa can finally be happy together. And who knows, maybe Alesa could recover her hearing in the future after a revolutionary surgery.