Some peep are happy and saying that vani is legal wife of madhav so that means ro is illegitimate and v will also suffer
But if I rem right as per Hindu marriage act , 7 years gap is der btw abandoning of vani ..so kind of marriage is invalid.. usually in cases where spouse is not traceable after 7 years the marriage is considered as dissolved legally
even if it's in valid the kid is legitimate since he has the blood of madhav