I'm sure that there's plenty out there feeding their babies baby jars and they never come to the attention of social services.
The family absolutely sound like they would benefit from some kind of intervention, but realistically that's unlikely to happen. Any change is going to have to come because the family want it or if she decides to leave.
Her eating habits might not be the norm but I don't think that they're that uncommon either, lots of people (women particularly) will say that they pick and don't eat full meals. And I'm sure some of the people saying how strange they are will have disordered eating habits themselves
As for the DS being abused, yes the dad never cooked and always fed him takeaway, I would definitely agree that that can be abuse unless of course they were always getting healthy takeaways which is probably unlikely.
But once again in your telling of this scenario you stop right before the part where she does in fact go out and buy the ingredients and cook for him, she doesn't say that she moans at him either.
And while a child who was neglected or abused may still feel the effects into adulthood, that doesn't mean that the abuse/neglect is ongoing.
If for example a parent refused to wash their kids clothes when they were small that would be neglect, but if they refused to wash their young adults clothes it wouldn't be.
But you're probably going to say that it would be abuse if he wasn't 'allowed' to wash his clothes, in which case I'm probably going to have to respond that there's a difference between being not 'allowed' and not being able to because they were using the washing machine for something else (like storing beer).
Also there are lots of parents who would have always made sure that there was homecooked meals who don't worry about what their young adults eat either!
I think the way the OP wrote the thread got peoples backs up, but if she had posted that her son filled the fridge with beer but then complained that there was no room for food meaning she had to go out every evening to buy fresh ingredients then I think almost everyone would have told her that the son was taking the absolute piss.