Despite the difficulty of getting in, Mona Lisa was determined to be with her brother and would go to any length to do so. Of course, she liked breaking in to steal his food and use his litter box, but siblings do it all the time.

Jean Ralphio will have to stay in bed for another week before he can safely leave the house. Until then, his mother had spent a lot of time in the bathroom with him, allowing him and Mona Lisa to spend some quality time together.

"She still stole his food and used his litter box during that period, but they also simply hung around and groomed each other," McLemore added. "It was quite nice, and you could tell it made him smile a little. I believe he has been disturbed by his separation from her."

Jean Ralphio and Mona Lisa will meet shortly, despite the fact that they are still apart. Mona Lisa will keep trying to break in to visit her brother till then, since that's what sisters are for.