I Don't Have A Close Relationship With My Younger Sister.

Hello everyone, this issue has been bothering me for a while now, so I decided to speak up here because I know I would get good 'advises' from people here. I come from a family of 3 girls (our only brother died when he was less than one), I'm the Eldest (22), the next is 19 and the last is 16. We stay with our parents in Lagos.


I was very close with my immediate younger sister, I still remember many fun times we had together. But our relationship started drifting apart during our secondary school period, we started talking less. I remember I reacted harshly towards her when she used a little of my N100 I was storing for midnight call and things even got worse from that moment.
She joined me in UNIPORT, and we were staying together off-campus. Some times, we barely say more than 50 words to each other in a day, she prefers to gist with our neighbors.

Whenever I see other siblings in my compound, I know something is not just right! We don't even gist normal girly stuffs like boyfriends, makeup, dresses & co, and it really bothers me. We barely even quarrel, I think for the past 3-4 years, we've only quarreled 2 or 3 times.
Though we are both close to our youngest sister.

So please advise me on what to do. Thanks.