Maintenance

Dear experts, I (father) have won the child custody (children aged 13 and 15) case and there is no question of re-union with wife. Divorce case is on. Wife well educated post graduate. In the mean time the wife's lawyer is demanding a sum of Rs.10 lakhs to close once for all the divorce and further proceedings on maintenance. I am arguing with wife's advocate that, since children are with me (father) due to children marriage and future education expenses I cannot pay any alimony to the wife. As the wife is well educated and aged only 45 she can very well fetch a job and earn for her living. Wife was going for a job for 2 years previously during 2010 and she is demanding the money earned by her during 2008 - 2010 when the family along with children were together. 1. whether she can claim the money earned by her when family and children were together? 2. whether my contention is correct and stand in the court. Please advice.