Yes, I don’t understand where the worry about the tax man and losing her home is coming from.
Nor does it sound as if he was hiding anything. It did from the OP’s first post, but the more posts there are the less it seems that way. She knew he bought investment properties and meets the tenants.
it sounds more to me as if the marital split has always been that she takes care of the children and he sorts the finances. I know couples like that. She has perhaps therefore not been involved enough in the finances to understand how the property portfolio works, and when she came across a document showing one of the properties was bought with a deposit and not 100% mortgage as she’d previously assumed, it has triggered a panic.
It is of course concerning that when she asked about it he wasn’t forthcoming (and shouted iirc). But if she flew into a panic and accused him of hiding money and breaking the law and withholding from the tax man etc etc, he might just have been utterly bemused and defensive.
OP, if there is a chance that the above is indeed the case, perhaps sit him down calmly and say you’d really like to understand the family finances and how the property investments work. Not because you suspect him of anything nefarious, but because you’re his wife and it’s your future too.
if I’m wrong and he’s just a controlling twat, ignore me.