Divorce

Gentleman , 

your mother can  obtain dfisolution of her marriage  with your father by filing  a suit  for the purpose  under the disolution of muslim marriage act ,  the grounds  applicable  on facts  would be

1. Cruel treatment by your father with your mother by makig her life miserable by cruelty    of conduct even if such conduct does not amount to physical ill-treatment, 

2  Unequal treatment by your father among two wives  i e  not treating her equitably in      accordance with the injunctions of the Quran, 

3 .That the husband has neglected or has filed to provide for her maintenance        for a period of two years;

4 That the husband has failed to perform, without reasonable cause, his marital      obligations for a period of three years;

Dear Querist,

In addition to the grounds above, however this divorce would be a contested one and may take some time, another remedy that you have is you can always try the mechanism of 'khula' by which your mother by giving up her of mehr/dower - may seek release from the husband, this is effective only if your father agrees to the same.