INKEE-BEAR: Exactly what is National Siblings' Day? I like to paw-tee but I gotta' know fur what! SOPHEE: I know what it is. It's the day when we celebrate being together, in our house, with our hooman. It's who we play with, who we cuddle with, who we don't play with, who we can't cuddle with. Understand? INKEE-BEAR: I get it.