Not a lawyer or solicitor, just an aspiring accountant who has studied some business law, so I'm only quoting exactly what is in my study materials.
"De Facto Director - a person who, although not properly appointed as a director has, nevertheless assumed that status and functions of a company director. A de factor director will be treated as any other director and can therefor be held liable for any wrong doing."
Are they being accused of fraudulent or wrongful trading by any chance?
All I know is that where generally being a limited company means shareholders' liability is limited to that if their investment, and directors are not liable, but there is a bit in my textbooks that just says "in some circumstances, a director can be liable to the company's creditors or be held liable to contribute to the company's assets on winding up."
Those circumstances might result in "lifting the veil of incorporation" so that the individuals running the company cannot hide away from the liability, in statutory grounds this could happen in 'wrongful or fraudulent trading discovered upon winding up of a company.'
I guess there are two or three questions in this. 1. Can they prove he was indeed a defacto director. 2. Can he be shown to be complicit in any wrongdoing. 3. Is there any wrong doing and 4. Where does that liability extend to - can it include marital property?
I'm sorry I don't know the answer to no 4.
But what I would do, is check your home insurance policy and if you have legal expenses on it, give their helpline a call and ask for advice. I'm not so sure this legal situation would be covered by that policy, but those folk tend to be very helpful and knowledgeable even if it isn't a covered incident - it might help you get a sense of what it is you're potentially dealing with.