We got ours 3 months apart...Brody was 14 months old and Mia was 17 months old. Mia is older than Brody by 5 days. They are extremely close...we've only seen 'cross words' between them twice and not for months. I think the issue then was over toys..."which are all belong to Brody"...even/especially Mia's.
But, she stands up to him and snatches them away now, and plays 'keep away' and 'guards' him off the loveseat protecting 'his' (their) toys from him...all in good fun, mind you! She's quite the little imp and instigator!
