1) on demise of father you have one fourth share in flat and 2 shops
2) you can enter into deed of family settlment wherein your mother and you are alloted the house
3) your brother and sister reliqnish share in the flat
4) give one shop completely to brother and sister in lieu of relinquishing interest in flat
5) as far as second shop is concerned you cna buy out share of mother , brother , sister at current market price
4) one shop can be sold