Divorce maintance

Hello Sir/Mam I seek legal advice in case of my cousin brother's marriage. My cousin brother (age 35) got married in Jan 2019. Both husband and wife (age 34) are graduate but not earning (jobless). His married life was good until 2-3 months from the date of marriage. He got some health issues and probably due to miss treatment ( as well as due to the psychological stress), it resulted in impotency. His wife and her family believe that his impotency cannot be fixed by treatment (just within 3 months of the treatment). And she wants to divorce. his wife and her family want following in form of maintenance. 1) They want to fix monthly amount till she gets re-married Note: Both husband and wife are graduate but are not earning (jobless). The husband doesn't possess any property on his name. 2) They want a share in bank balance posses by husband's mother 3) They are also asking to reimburse the marriage expenses incurred (Like: marriage hall booking amount, dinner amount, etc.) 4) They are also claiming on all the pieces of jewelry given by husband's side to the wife as gifts. They also want back all the gifts given to the husband by them as well. 5) They also want an affidavit signed by the husband that he will not re-marry later on. Could by please advice do they entitle for all above demands, if not what are the entitle for? If we can prove in court that his impotency is temparary, what be could the next? Note: Husband's family is a middle-class family. His mother is working in govt. job and have many dependants.