Legalisation right on property

Hello sir....my father s elder son in the family wit other 3 brothers....my grandfather died 15 years ago.....my grand ma is alive.....v have a house in Bangalore.......wch s of my grandpa.....my dad with my mom....my last uncle with his wife r living in d building.... V are taking care of granny..... One uncle is in andhra.....other s in some other place in Bangalore...... 5 years before.......all of them mutually agreed to divide d property in to 5 parts.....so as a share v got one shop where there's provisions fr my dad......since its 5 shares...... Including my granny....... My first uncle got first floor as share...... He asked us to pay rent.....it was not legally divided..but v started to pay rent from 2011.....now they are asking us to leave home , if v can't pay more rent.....v are not in position to go out due to our financial status......it is not legally divided.......oly word of mouth....they r not ready to sell the property also.nw my que s tat ...... 1. What are benefits tat my dad has being elder son 2. Since me nd my sister (married) are girls do v entitle to ask fr share 3.should v really pay rent since its not legally divided 4. If v divide legally .....the entire part of our shop in groound floor and tat site belongs to us 5. Can v sell tat part 6. How can v take action legally Please answer to my que.....