Want this question answered?
yes
Generally yes, as long as the relationship can be proved. There are some variations in that rule. You should speak to an attorney if you would like to make such a claim.
An adult child is a natural beneficiary to an estate. If there is no will, and there is no spouse, they are likely to get the estate.
yes
Yes; however, doing so does not establish paternity.
no
Only Arizona has a law granting single fathers any presumed rights to a child born outside wedlock. I teach single fathers how to get their rights. See link below
I can't find any evidence that he ever had a child out of wedlock.
In the US, the parent[s] can give the child any name they choose. However, doing so does not establish paternity.
An out of wedlock child is entitled to the same share as an in wedlock child. It is the biology that is crucial and not marital status. You should check the laws of intestacy in your jurisdiction.
No.
It will typically be the child. The law does not care that the child is not the issue of marriage. If the child is underage, the money will be in a trust fund. Consult a probate attorney in your state for specific rules of intestacy.