No Eijaaz's mom has seperated from her husband and her son's whilst she was already pregnant with her daughter.
The sons and the father had no contact with his mother or the daughter after she left. His mom died when his sister was young and the daughter was brought up by his materal grandparents.
Eijaaz and his brother never met the sister till I think Eijaaz turned 20 or something. He met his sister without telling his father and bonded and when he became a big name he funded for her marriage and all. I know all this because I saw one interview of Eijaaz where he said all this.