This is the 21st century. DNA is not a lie. It will come out.
It SHOULD come out.
You need age appropriate counseling for the child and to get a lawyer involved to do an adoption right. Yes, if possible.
Don't do your son wrong like this.
1. Get a second opinion from a lawyer who expresses confidence in their statements / guidance
2. Ask your current attorney to articulate their thoughts more definitively or to explain why they appear indecisive
3. Do both of the above.
Um, well... This seems like a silly / crazy perspective to take...
Also, it sure sound like you and your spouse are NOT aligned
This is supposed to be a very active process, not something that just happens to you.
If your agent is underperfroming, tell them and maybe cut them loose...
It would be a tough option, but yeah it is. Your grandmother is not the first person to be land rich and cash poor. Step back from the family legacy angle and see the situation, a property with a complex title and contentious owners and a house that you say is in poor repair and a looming tax...
Offer to sell your share to one of the other 3 owner entities could be one approach to getting equity out.
Bluntly, you need legal help to protect your assest. You need to act on that very very soon. You need to come to terms with the fact that you may have to pay the whole tax due before...