My kitten Ivan, on the left (he's 5 1/2 months and huge!) is totally in love with my girl cat Matilda (on the right, she's about 4). I really think he thinks she's his mom! And Matilda loves him too. Ivan will walk over to her and ask her to lick his face and of course she does! My other cat Percy (Russian blue mix) loves his siblings but he likes his space more.
