S.:
Hello and good morning!
I am truly sorry about this situation you are in.
My girlfriend, whose husband disappeared, had to file an ad in three major newspapers - one where he was last known, one where he parents were (since they lived in a different state - the assumption is that a person won't lose contact with his parents) and the other in your local paper.
I would suggest contacting a lawyer to ensure you have done everything "by the book".
I'm curious how a man can just up and leave and not contact his children - you have his social - have you tried running a credit report on him to see what that says? Have you tried contacting the IRS to find out the last W2 - how have you filed taxes in the last 3 years? Haven't your kids asked about their dad? If so - how have you handled those questions?
Now on to your dream business - put a business plan together, go to your bank and try to get a business loan. You can also apply for grants so you can start making your dreams come true.
I hope all works out for you.
Best regards,
Cheryl