It is an unusual situation for a mother cat to be pregnant with her son's child. This means that this little being will have the genes of the mother cat and her son. This might give it some unique characteristics and character. Although this situation may be confusing and surprising, we still need to give this little life plenty of love and care.
As humans, we need to look at this situation rationally and give the mother cat and her baby enough support and help . A female cat needs more nutrition and care to ensure that both she and her kittens grow up healthy. This little life is innocent and we need to treat it with love and care.