When you see the same behaviours over and over, they're easy to identify. Just as a doctor can identify a rash because he's seen it umpteen times.
I don't dispute you have covered yourself by saying 'maybe' the relationship is abusive, I say there is no maybe about it. You don't seem to be aware of what emotional abuse actually consists.
Identifying abuse is not 'dramatic' or 'fanning the flames' and it's rather immature to say so. It's simply bringing clarity to a confusing and traumatic situation.
There are key indicators in the OP's posts that this is an abusive relationship:
1)'My sister is a basically a prisoner in her own home', she says, 'trapped in a horrific and unhealthy environment'. Are these characteristics of a normal healthy relationship?
2)The husband is 'manipulative' 'controlling' 'monstrous'.
The key elements of abusive relationships are power and control.
Here is the [http://www.ncdsv.org/images/powercontrolwheelnoshading.pdf Duluth Model power and control wheel]]
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The sister has 'raised her children single-handedly' in other words her husband has taken no responsibility for the children or contributed to childcare. Indeed he seems to have prioritised his drink and drug use over childcare.
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Then there's the classic pattern in the sister's attempts to leave:
The sister tells him it's over, he refuses to leave, he goes 'crazy' unleashes verbal abuse 'shouting and swearing', then swings into emotional blackmail by 'dissolving into hysterical tears' and going into a 'deep depression'. Then he 'turns over a new leaf' and lovebombs her by being 'clingy' and 'smarmy' in an attempt to save the relationship and to control his wife. Then she reminds him it is still over and the cycle begins all over again.
This is all the abusers script. The same pattern gets repeated over and over again in this and a million other abusive relationships.
6)All of this is played out in front of the children which is extremely damaging for children, all the more so for the ASD child. This man seems to have no consideration of the damage his behaviour is causing his children.
- The OP describes her sister as 'just about clinging to her sanity'.
This is not an ordinary difficult marriage breakup, it is emotional abuse pure and simple, and it is clearly, sadly taking its toll on the sister's mental health.
Ending a relationship is one of the key factors for escalation of abuse. That is the point at which women are most in danger.
In the UK the sister would likely have been advised da charities not to tell him she was leaving until she had an escape plan. And a good solicitor experienced in da may well have organised to serve the divorce papers, a non-molestation order and potentially an occupation order all on the same day, to protect her and the children from harassment and abuse consequent on ending the relationship.
I am aware that the OP does not use the term abuse. She may not identify it as abuse, although I think it unlikely as the OP asks if her sister would be eligible for a refuge place without the presence of violence: refuges are only available for people in abusive relationships. Furthermore her sister has clearly been in contact with the police.
There's no doubt the sister needs professional help. She needs support from da workers, from a counsellor/psychotherapist specialising in abuse and ideally the Freedom Programme A life coach would be fuck all use in this situation.
Her lack of work may not be due to ignorance of career options so a career coach may not be much use either.
It's quite possible that her husband does not want her to work and has made it difficult for her to do so, that's fairly common in these kinds of relationships. In addition Italy is a traditional patriarchal culture, (I have a house there so I am very familiar with it), and there's more expectation and pressure there for a mother to stay home with the children.
Finding childcare for an ASD child is very difficult and in the obscure corner of Italy that she lives those kinds of services may not be available. Depending of his level of disability she may need to be able to leave him for long periods. It's also quite possible that what she earns would be all but wiped out by childcare, even if she could find it.
I did not say that 'moving far away was the only option', I said it may be necessary to 'get right away from him' not the same thing. My point was actually that's it's not a good idea for her to stay within the same neighbourhood. Given contact issues it may not be possible to move 'far away' even if she wanted to. But living in the immediate vicinity will leave her open to continued harassment. Moving to nearby town may be enough distance, it depends on him.
Violence is not the only reason women sometimes have to get away from the abuser as you seem to think. Emotional abuse is equally damaging, and can push women to depression, anxiety, breakdown and PTSD. That is why refuges take victims of emotional as well as physical abuse.
In the short term it sounds as if the OP's sister needs a break and time to recover so it may be necessary to get away from him for a while. She may be able to get 6 to 8 months in a refuge. Once she has recovered she may feel more able to cope with her husband's behaviour and it may be possible to get it under control legally so that he cannot continue to harass her (ie with some kind of injunction). Although I wouldn't personally want to rely on Italian police for its enforcement.
As regards potential damage to the children losing their relationship with their father - you're projecting a long way ahead and it may not come to that. But as you brought it up I have to say you seem to be entirely unaware of the damage of emotional abuse on children even when they are not the target. You have to weigh up the damage on both sides. This man does not seem very concerned at the impact of his behaviour on them thus far. And if he behaves as appallingly with his children as he does with his wife, then they may need protection from him. It's unknown as to whether he's responsible enough to look after them alone given his lack of involvement, his drug and alcohol use, and his general 'monstrous' behaviour. A further issue is that abusive men sometimes manipulate their children too order to get at their ex partner.
Finally, as regards the ASD question, I did not intend to imply that you were suggesting ASD with reference only to his drug and alcohol use I simply picked it out as the most absurd aspect. Clearly you were raised it with regard his behaviour in general, which you describe as 'difficult and immature'. A description as woefully inadequate as it is naive. It's emotional abuse pure and simple.
I too have some experience of ASD as I have a family member with it. ASD can cause challenging behaviour but you are no doubt aware that ASD does not cause the behaviour described by the OP. That's not to say he's not on the spectrum, but that cannot be the whole story and mental health issues are another obvious possibility. Ultimately the cause is not the most important issue, but the effects on mother and children and what to do about it.