If you are an elder brother/sister, how is your bonding with your younger one?

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I have a sister younger to me,when we were small I used to be on her side when anyone scolded her or misbehaved, we used to share our clothes,play together and share our feelings with each other,on the other hand sometimes we used to fight for some silly reasons..but compromise again,we had gud bonding relations...When she got ill sometimes I used to do homework for her. When we became adults, we had the same bonding.. What about you? do you treat your younger brother/sister with courtesy?How is the bonding between you both?