Sister being harassed from Day 1 in her in laws house

My sister got married last month. Her in-laws are harassing her and torturing her for money. Finding fault in everything she does. We found the match via matrimonial website. Her husband didn't mention his smoking and drinking habits. Even though he is earning decent money, he is always short of funds. He hurls abuse at my sister and asks her to leave his home. He once even pushed her out of his home late at night. He drinks and smokes almost every day. He has increased cholesterol because of that. He is very manipulative and lies all the time. He makes things up like being threatened to be beaten by us. (we have recording of his lies) We paid for all events from roka to Wedding. Even partially paid for her honeymoon. We gave her a decent amount of gold and gifts. We have recordings (they asking for chain and FDs) and receipts of jewllery and transfers made to them for paying Banquets and all. My questions are : 1. Are call recording and other recording acceptable in court? 2. My sister's jewellery is in a locker of his in laws at their native place? 3. while my sister is there, if any thing alarming happens like fight or if his husband hits her what should she do? 4. Should she leave her home on her own, should we go there to bring her back?( keeping in mind we want to get back the jewellery given during wedding) 5. Can this marriage be annuled?( as lied about his height, habits and he has some sexual issue though I am not sure as he consulted with a specialist about it) 6. As my sister not working, will she be entitled to alimony or maintenance? 7. What cases can be filed against such fraudster and cheap person and his sister who fuels and controls her brothers demeanour ? Thanks