Pls download service rules and Conduct and Discipline rules of the establishment and preferably attach or mention weblink.

The seasoned employees union leaders of any employee of establishment can guide and help...........

Generically Speaking/For Generic Reference:

(5) Conduct of Government Servant in relation to the proper maintenance of his family

Instances of failure of Government servants to look after the proper maintenance of their families have come to Government’s notice. It has been suggested that a provision may be made in the Central Civil Services (Conduct) Rules, 1955, to enable Government to take action against those Government servants who do not look after their families properly.

2. The question has been examined and it has been decided that it will not be possible to make such a provision in the Conduct Rules as it would entail administrative difficulties in implementing and enforcing it. However, a Government servant is expected to maintain a responsible and decent standard of conduct in his private life and not bring discredit to his service by his misdemeanours. In cases where a Government servant is reported to have acted in a manner unbecoming of a Government servant as for instance, by neglecting his wife and family, departmental action can be taken against him on that score without invoking any of the Conduct Rules. In this connection, a reference is invited to Rule 13 of the CCS (CCA) Rules, 1957 (now Rule 11) which specifies the nature of penalties that may, for good and sufficient reasons, be imposed on a Government servant. It has been held that neglect by a Government servant of his wife and family in a manner unbecoming of a Government servant may be regarded as a good and sufficient reason to justify action being taken against him under this rule.

3. It should, however, be noted that in such cases the party affected has a legal right to claim maintenance. If any legal proceedings in this behalf should be pending in a court of law, it would not be correct for Government to take action against the Government servant on this ground as such action may be construed by the court to amount to contempt.

[MHA OM No. 25/16/59-Ests.(A), dated 01.09.1959]

https://www.referencer.in/CS_Regulations/CCS(Conduct)Rules1964/GOI_Decisions_03.aspx

You may without any hesitation discuss with compassionate officiers/officials in establishment, seasoned employee's/trade union leaders, a very able LOCAL senior counsel of unshakable repute and integrity specializing in service matters and well versed with matters and service/conduct rules of establishment (union leaders can help and you can also inquire at Civil Courts/CAT/HC and even staff at DLSA can suggest, even DBA officials can suggest ) having successful track record and proceed further under expert advise of your counsels..................

Many of the compassionate LOCAL counsels may not charge a FEE.

You have the option of approaching DLSA and they are also compassionate and competent.........

1st of all try your level best thru your own efforts of all 3 children to help him realize his responsibility then thru relatives, compassionate near and dear ones, persons of repute etc etc

You may get some respite.

You may go thru:

Protection of Women from Domestic Violence Act, 2005: Sec;12

https://ncw.nic.in/acts/TheProtectionofWomenfromDomesticViolenceAct2005.pdf

Application to Chief Metropolitan Magistrate can be made…

You can also approach nearest PS…

Check with your counsels on  option to get to bond of good behavior to keep peace through the Magistrate and  order to put a stop to domestic violence. ….and to deposit securities; money or property, to be forfeited if he continues to act violently.

 A Delhi HC Lawyer Has Been Caught Mercilessly Beating His Daughter Because His Wife Couldn't Give Him A Son

https://www.mensxp.com/special-features/today/33983-a-delhi-hc-lawyer-has-been-caught-mercilessly-beating-his-daughter-because-his-wife-couldn-t-give-him-a-son.html

https://www.scoopwhoop.com/Delhi-Lawyer-Caught-On-Video-Beating-Daughter/

Woman drags dad, brother to court for domestic violence

https://timesofindia.indiatimes.com/city/delhi/Woman-drags-dad-brother-to-court-for-domestic-violence/articleshow/46363658.cms

Daughter complains against father in domestic violence case

https://www.dnaindia.com/mumbai/report-daughter-complains-against-father-in-domestic-violence-case-1269793

Try to find some source e.g; tutions that betters your social circle and also gets you some earnings and be self sufficient as much as and as early as possible.... 

Expnese on marriage are Father's responsibility...

GO thru;

Bombay High Court;Nagpur Bench;

Kusum krishnaji rewatkar vs krishnaji nathuji rewatkar

https://indiankanoon.org/doc/791491/

Expnese on marriage are Father's responsibility...

GO thru;

Bombay High Court;Nagpur Bench;

Kusum krishnaji rewatkar vs krishnaji nathuji rewatkar

https://indiankanoon.org/doc/791491/

You are welcome.

Wish you the best.

The prespectives that you have in mind, might be possible.

Try if the matter can be resolved by amicable means and  within four walls of home... or with elders of the family..............

If all tolerable limits have been crossed and there is NO scope of improvement in bad conduct then you have been provided with applicable enactments and rules and laws.............

Litigation can be stressful and it may be kept in mind.

The employee your father should not commit such transgressions as consequences can be highly penultimate and damaging.

He may realize and mend  his ways.

Apply your own judgment.

You are welcome.