The one and only Ivan

The One and only Ivan reminds me of the book Room,because Ivan has been in a cage for most of his childhood life.and in Room Jack has been in room since he was born and got out when he was five.Tahat is the first similarity.The second similarity is that both Ivan and Jacks mom (not Ivan's mom)were kidnapped.One difference is that Ivan's mom was killed by the men that kidnapped him and his sister.That right there is another similarity that both Ivan and Jack have,they both lost there older sister.Another difference of Jack and Ivan is that Ivan was sold to a circus type mall thing where people payed money to come and see him either play or draw something.Where as for Jack never saw the outside world and Was in a shed he called Room,no windows and the only way to get out was the door but it had a passcode which only "Old Nick knew.That is all the similarities and differences in the books The one and only Ivan and Room