Help!!!Who is Sia???

Hey,

I am a new member and I am watching Astitva with interest. Right now we are not at the part where Anand is introduced along with Sia. So I wanted to know who Sia was and her relation with the rest of the crew.

Thanks.

OMG! What are the writers thinking, I mean I understand she does not know that he is her father, but still she must see the age difference between them and realize that this person is old enough to be her father!