Here's why I think so:
Bhago - Obsessed with getting her daughter married. After marriage, forces Anandi out of school and then insists on sending her to the Saasra, when one of the village girls elopes. Despite Bhairon's objection, Anandi is sent away from her mother's house (traditionally in child marriages a girl is sent to the Saasra only after she reaches puberty like Suguna, but because of Bhago's obsession Anandi is sent here as a child). When Anandi runs away after being locked up by Dadisa, Bhago sends her back to the Saasra and convinces Anandi that she should lead her life only as per the dictates of Dadisa. That was a lesson Anandi would remember all her life. Bhago's involvement in Anandi's life has ever since been quite minimal, till her recent volte-face in accusing the very same saasra of ill-treating Anandi.
Sumitra - Timid by nature, she is content to leave the upbringing of her son in the hands of her mother-in-law. She has no idea of where her children are and what they are up to. She is equally at loss when Jagya gets into bad company at school, Suguna gets pregnant or Anandi (whom she treats as a foster daughter) is bullied by Dadisa. All she has done all her life is shed tears, and Jagya's second marriage has given her fresh reason to indulge in her favorite activity around the house.
Suguna - So involved is Suguna in winning the approval of Shyam's family that she fails to notice that Tausa is harming her son or terrorizing him after breaking his legs. In as much as Tausa, Suguna too is equally guilty for the handicap of her son.
Phooli's Mother - First she treats Phooli as a burden because she is widowed at an early age, then she tries to get Phooli married off to someone, knowing fully well that the man she is getting her 10 yr old married to is at least 20 yrs her senior. Phooli's education is only because of Bhairon's insistence. When the village louts harass Phooli, again the mother disappears from the scene and actually doubts and berates her own daughter. Then she tries to sell Phooli to get rid of her debts. Luckily for Phooli her dead husband's brother wants a child and so is ready to keep Phooli as his second wife, No idea what the future has in store for her, however.
Gaur's mother - Less said about her the better.
Gehna and Dadisa - Amazing way they are bringing up their children. I commend Dadisa for the values she has given Basant and Bhairon. Kalyani Devi might not be a good Mother-in-law or a model Grandmother. But when it comes to being a mother, she wins hands down. The other strong mother is Gehna. I like the way she is hawk-eyed about her son's education and even keeps a vigil on who he is playing with and his leisure activities. Way to go girl.