These Two

 Maggie (age 4) and Alexander (age almost one) share a bedroom, a sense of humor, and a secret language that apparently only Maggie can interpret. 

Xander says "Bababadadada" and Maggie tells us "He says thank you for dinner and he needs more water".  Or Xander screams, and Maggie says "He's mad because the boys picked a scary show (anything that's not Dora) and he wanted to watch Dora!" 

She may hug and kiss and squeeze him a little too hard on some occasions, but most of the time it's all baby coos and cuddles and sweetness.  She tells him he's the cutest, and obviously he tells her the same (at least that's what she hears from his babble).  They play together every morning in their room and make up games throughout the day: I'm a princess and you are my pony.  Now I ride in the carriage and you push me:

Alexander just loves the attention of a playmate and Maggie loves being the bossy helpful big sister.  I'm so glad that even though she didn't get a baby girl like she had hoped for, she got an awesome baby brother who seems to tolerate her personality very well!