Though he once treated Ivan as if he were almost his son, his life kind of went sour after his wife left and he grew less attached to Ivan, who was a sore spot in their marriage. These days, Mack drinks and his ethics are, well, questionable.
I think it might be the word " soul mate " ?
Answer:
Just thinking about all the things they'll be doing and all the fun they will be having can host their mood
Https://www.enotes.com/topics/zookeepers-wife
there is a summary of the book, if you dont know the answer i suggest you read the book or read the summary (:
