1) your father should move court and obtain order to direct son and daughter in law to vacate portion of house in their possession .

2) also obtain permanent injunction restraining son and DIL from disturbing their vacant possession of the house

3) in case any false dowry case is filed obtain Anticipatory bail

4) your parents as senior citizen can also move senior citizen tribunal against son and seek maintenance of Rs 10,000 a month

5) refuse to bow down to blackmail tactics

6) dont transfer property in name of DIL

1) issue legal notice to your brother to with draw false and defamatory statements made within period of 7 days of receipt of notice

2) if brother fails to with draw allegations file criminal complaint of defamation

3) in addition you can also file suit for damages

4) audio clips are admissible in evidence . you have to prepare transcripts of conversation and submit it in court

I signed on that letter along with all persons.But she with her husband not signed yet on that letter.They are rigid to file a case on dowry and on domestic violence. What should my parents and I to do ? I am a defence personnel and keeping my family with me.My parents are residing in newly built home at village.Since my service I helped my parents economically and set my brother as a constable in BSF. After 'N' times of fake allegations we are living in a feared environment.We have forgot to live with dignity.We Please guide us.

Generally the wife used to allege husband and his close relatives on this dowry harassment case but it is a different case here that the husband has not been included on the false case.

Well nothing to fear about this.

If she files a false case then first all of the accused should first take anticipatory bail and then challenge her false cases properly

If need be , you may even file quash petition before high court.

Your mother can send a notice or file eviction suit to evict them from her property.

Take the help of a good local lawyer on all such further issues.

Should I file 'Man-Hani' case on my younger brother and his wife on the basis of their letter,which he has sent to my defence office or, first I gave him a legal notice to clear their allegation and then file a case

You can send a notice under laws of defamation in this regard and seek his explanation as well as compensation. After getting a reply you may decide about further proceeding on it.

The audio clip which has proof that how dirty my younger brother's wife abuses my wife , will be valid in court

These are not admissible evidence in court.

May my job is in danger due to such fake dowry/domestic violence allegation because they have not a single valid proof except their oral complain which may take form of written in front of police?

This would not hamper your employment. However it would better that you obtain anticipatory bail.

How can I save my self ,my job and my family from such fake and dirty allegation from my younger brother and his wife side.

Challenge and properly defend yourselves based on the evidences and merits in your side before the trial court.

1. If criminal case is filed against you and your parents then all of you should apply for and obtain anticipatory bail lest you suffer arrest and detention.

2. The audio recording can be led in evidence in the court.

3. You are free to file a criminal case for defamation against them if you have evidence to prove the falsity of the allegations.