Divorce

Respected Sir, My nephew got married in Dec 2019. His wife having bipolar disorder used to quarrel with him and with his mother all the time. The mother was diagnosed with Breast Cancer in September 2020 for which surgery took place in Oct 2020. During this period his wife went to his parents house and did not come back till date. My nefew filed for divorce in may 2022. When his wife came to know about this she loged a FIR against him and his family members for dowry, mental cruelty and 498a. My question is what should we do now as we know that this FIR is completely wage and frivolous. Is any action can be taken by court and police on this late and wage fir or should we apply for anticipatory bail. He resides in Bangalore along with his mother and the divorce has been filed in other state in his wife's parental home where his wife filed the fir. One of his sister named in fir lives in Delhi. So for anticipatory bail which police station should be contacted. We have not received any notice from police since the date of fir I.e. 02 Jul 2022. Please give your advice so that we can arrange our defense and can get anticipatory bail.