Who is Mrs. Rupa Mehra from A Suitable Boy: A Novel and what is their importance?

Mrs. Rupa Mehra is a widow and mother of Arun, Savita, Varun, and Lata. She is a traditionalist and a firm Hindu. Since she is widowed, it falls on her to find suitable spouses for her children, an avocation she goes about with diligence, never taking the wishes of her children into consideration.