DD1 and DD2 are 15 months apart and are self-proclaimed best friends. Especially since DD3 arrived 3 months ago though its become apparent they are really dependant on each other and are completely lost if the other is having a nap or is out with daddy, etc. DD1 slept in randomly this morning and DD2 wandered around crying and asking where she was until she got up.

Does anyone else have non-twin siblings who are attached at the hip? When did they adjust to being apart if ever?