Calliope Loves her brother

Well this has been a fairly good adjustment over the last few weeks. Calliope is extremely loving of her brother and is constantly giving hime hugs and kisses. Just today I had him laying on the floor and she watching cartoons. I came in the room minutes later, she was fixing his blanket and cuddling up beside him. She looks into his eyes, holds his hands and laughs at his tiny feet. She pats his head and belly and tells him to calm down and take a deep breath when he is crying. Is this the begining of a wonderful friendship??? or at least until he can start grabing her toys?