Hi Ashlea.

My mother was 17 when her little brother was born (age gaps +1, 0, -3, -5, -17; she is 2nd of 5), she left home when he was 5 and she married my father. They have a very close relationship, sometimes I think she acts too much like his mother (I swear he gets more mothering from her than me!) and she always has him and his family round and looks after them. It's very different from the other sibling relationships and she acknowledges she treats her baby brother very differently, that she wants to look after him, but they are very close still.

Hope this is what you were after.