Violation against women act

Sir! You people are the most capable personalities in the world who can made judgement by your brain ,logics n knowledge..sir my sister is a govt teacher in primary school n she was married in 2005 and now she have two kids..her husband is also a govt teacher..our parents did the marriage according to hindu rites and this was arranged marriage....after passing some time she came to know that her husband is habitual drinker and when she started opposing him ,he started to abuse her father ,mother ,brother and also started to beat her ..he used to take mobile phone from her by which she would not be able to communicate with their parents and brothers..her father is now ill and now not capable to handle the situation by virtue of understanding them.her husband also abuse her father and he warned her brother if he calls it would be harmful for his sister n all nuisance whatever he can ..so can I know what can be done in this type of case..how can we handle him and the relations both .... Regards , A brother