Sounds like this might be a case. If the owner released shares without amendments to the articles of incorporation, thus diluting the value of your own shares, this would be a solid case for fraud and breach of various duties.
In law everything is in the details. You should talk to a business litigator in your area to really flesh out the details and do some research.
If your injury prevents you from full time employment then you can look into social security. Otherwise this would be better asked of a contract, tort, and/or employment law attorney here on Avvo or elsewhere.
Very sorry for your loss.
You should contact a local probate attorney to help you walk through all of this.
The first thing to do is go through any paperwork he had to see if you can find an original copy of a Will. If he did not, then his property will pass by intestate succession, which is a little complicated but would mean that as a child you would have a legal right to some or all of his property - regardless of how estranged you were.
Your next move would be determined by the...
A post-nuptial agreement, along with a revocable trust to place any assets agreed as your separate property would be a good start. Re-titeling certain assets may also be available depending on what loans are still on your car and/or home.
Regardless, there is still a limited ability for creditors, even in a DUI, to gain access to your share of the community property. In order to do so, your husband must have been acting for the benefit of the community when he was driving. So it will depend...