Depends on what you mean by heir.
If you mean will the illegitimate half black child be in the line of succession for the throne . . . no, he will not. That requires a legitimate heir.
Prince Albert has said that the "succession is secure" ... meaning that, even without his having a legitimate heir, his sisters/sisters'children can succeed him [even through the female line, now, I believe].
And isn't there something in their constitution that the country reverts back to French rule if there is no Ranier heir (male or female) to take the throne?
"Depends on what you mean by heir."I read an article some time ago that stated race was an issue,and he would never be accepted as an heir,because his mother is black.I thought that Euro nobility was egalitarian??
His sisters children can succeed him."The Sweedish royal family did the same thing,no male successor,and a daughter will carry on the line.Curious if he'll have any inheritance rights under the law there.I assume he and his mother(very attractive)will receive some assistance,afterall he is the dad.