Much will depend on the nature of your business, where you intend to conduct business (just in PA or outside of PA) and your current financial situation and objectives (does one spouse have liabilities that require attention vs. those of another). My law firm is based in PA and has numerous people that can assist, as can other well-qualified people here on AVVO.
You may have some remedies under state law to attach assets in the US. I would work with a private investigator first to ascertain whether this Chinese company has any US assets. I would also check to see if the Chinese company or its subsidiaries were authorized to conduct business in your state by a quick check of the Secretary of State website. At least you'll know if you'll be chasing these guys in China or the US.
In addition to the other answers here, if you do not know who the party is and the source of the funds, you could be running afoul of anti-money laundering laws and OFAC regulations. This isn't how "anonymity" for a venture investor works in the least. You have to perform your own due diligence on the source of the funds and bona-fides of this individual before you even think about following through with this.
And yes, the conduct you describe to date has all the earmarks of a scam.
If you're concerning about corporate governance issues and will be taking in additional investors, then incorporating outside of CA in a place like Delaware Nevada or Wyoming is worthy of consideration. If not, you should likely form your company in your homestate. While the corporate form provides protections to some degree, it is best to have an attorney work with you to ascertain what structures work best to meet your objectives.
While I happen to work with an attorney who handles EB-1, EB-2 and EB-5 matters, you are going to require significant assistance in dealing with (a) taxation issues and (b) customs matters as well, in addition to corporate formation and the potential means of raising money. Happy to discuss further.
You are thinking of the EB-5 program. You have to invest money (500k - 1mm) in job creating entities and money needs to be at risk. If you're thinking about getting involved with one of these programs to obtain a green card, you not only need an immigration attorney but you ABSOLUTELY need a securities attorney to review the offering documents and bona fides of the offering. Further, EB-5 sponsors charge a service fee on top of the investment, usually 2-10%.
Your attorney is entitled to the fee they earned and the payment of expenses incurred in prosecuting your case. There's only one reason why someone asks for a settlement not to be sent to one's counsel. You know what that reason is.
In short, you can pay now or "finance" paying later with the costs you incur in defending a lawsuit. Don't even begin to think that the two year statute of limitations on malpractice helps you on this. You'll owe what you owe sooner or later.
I handle commodities matters and this seems highly peculiar, given that your positions were to be purchased at the outset. But what may have happened is that if your positions were purchased and not paid for, those positions may have been liquidated. And since that time, the price of the contracts may have gone up. But what may be the case is that the positions are fictitious, which would of course allow them to set whatever price they want for whatever time the "contracts" were allegedly...
You have a right to demand a review of the books and records of the partnership most likely. The course of action here would be to go to court for an accounting and turnover of what you believe is yours. Whatever course needs to be taken, however, will require an attorney's review of the will, whatever corporate documents you have, K-1s and correspondence and other documents from the older son.
You might also want to consider getting a private investigator to check out whether the...