Taavi

suchi and goher both sisters were studying from same college.suchi was for 3 year senior from goher.they can easily identified that both are sisters whoever watch them.the way of walking and talking almost same and presents like they belong to a rich family.goher was my class fellow.they were calm and polite.
taavi taavi is another sister of them.they have no brother.goher often used to say about her with me.
taavi was so unembitened for their parents cause of helpless of her habits,but she was humerist.but I don't know,there was something special in her which separate her from her sisters. After all how could it be possible that two of sisters are but another third was totally different from them inspite of living in a same house.
well one day Goher insisted me to come to the ground.. cause taave is being there.we both run..taavi was sitting with suchi.i said hello but she didn't reply.infect she offered me a chewingum which she was already chewing in her mouth.i just shocked of her silly behaviour.litterely she had something special. above my thoughts,she was more attractive and funny lady.
one day Goher was arguing with taavi on a phone call.Taavi is older than Goher but she was always acting like a little child.taavi lied to her principal that her grandmother has passed away,to get a short leave.so she was insisting Goher to tells baba(father)say the principal about this same stuff when she would call you.hahah I mean how could she do this.
then oneday I get to know something by which I get answer my question..but many other questions standed in front of me.this thing is that taavi is step sister of suchi and Goher.and she is living with both of them..and I never asked to Goher about their relation..not even that,is this true..that taavi is...
and I will never aske her,I think she do not want to talk about their relations.