First, it is important to conduct DNA test to confirm the paternity of this child, that is the only way out to iron out this issue.
Secondly, it is impossible to have such child when two parents are black if DNA is not conducted. This baby does not have physical resemblance of the father, giving the impression that the wife cheated on the husband.
It is a pity that this man is trying to protect his family maybe due to the fact that the wife might be the bread winner of the family. If the husband is a man enough what stops him from seeking DNA test and prove to the world that the outcome is miracle.
In conclusion, if i were this man, i will sent this woman packing immediately without delay, because she is a cheat. The three children she gave birth did not resemble each other at all, it shows three of them have different fathers .