Why Rajamouli isn't seeing his Sister?

Now, we don't know how many sisters did Rajamouli really have in his real life but Music Director Sreelekha is a sister to both Keeravani and Jakkanna. While everything is well and good with in their family, many does not know why Rajamouli always prefers to take only Keeravani while Sreelekha is also efficient in giving wonderful melodies. During a recent talk show, Sreelekha is questioned the same and here is her reply.

'Actually Music is in our blood. There is no competition between any of us. Rajamouli Annayya always picks up Keeravani Annayya only because they are a successful combiantion. Who ever it might be, whether sister or any other relation, no body would prefer to break a winning combination. However, I don't like approaching any of them for an offer.'