Wife goes out to her mother's place quite too often

Hello there, I'm a software professional based out of Chennai. I've been married for about 4 years now, and have a one-year old kid. I have a problem with my wife going out of house, and staying at her parent's place quite too often, like 10-12 days every month. Before this, there's been huge fights with my wife/her parents and my family as they tried to cunningly brainwash me into moving along with them (for some shady legacy-related reasons), but I politely refused. Only thing was that, the marriage didn't end up in divorce. Currently, there's no talking terms between the two families. So my wife holds a grudge all time, and talks with sarcasm and acts with a grudge everytime which is a pain, but I choose to put up with it for fear of losing my son if things turn into another big fight. Now the problem: She goes out way too often to her parents place under the pretext of taking a "break". But this is not acceptable by me. Neither her parents nor her other relatives ever come to my house, but she's going to all their places while taking my son along with her, and without due permission from me. I mean, I don't care about her, but she can't just take my baby to whoseever place who do not respect me. I see this as an insult. Moreover, I look forward to giving my son good education and an elite lifestyle.. I fear his future could get impacted if he starts mingling with these swines that roll in alcohol money. I've been thinking of ways to curb this practise, but do not want to stir up a fuss all over again. But then, I want to keep myself clear of any 'bad practices' like abuse, just in case things end up in court for a divorce hearing... Now the question .. 1. Can I lock out the house in case she goes out uninformed for several days without my approval, and allow to return only if she get proper approval? 2. What else could I possibly do to prevent this from repeating, now and in future - maybe several years later as well? Note that talking to her or convincing her to discard that sort of behaviour is next to impossible. Let's just leave it there. And also, she's too crude and barbaric for any counselling kinda stuff, so lets just prentend it's not even an option. And she's disrespectful and doesn't give a crap about me. Thanks in advance!