I am very sure that Manav will take very good care of Purvi .He always was there for her even when he was not with Archana and now Purvi is officially his daughter so how can he neglect her ? I am sure he will be seeing her very soon and taking care of her just like he takes care of Ovi and Teju ...
he is feeling very ashamed of his behaviour and wants to keep Archana happy in every way he can and he knows what Purvi means to Archana ..Purvi seperating from Arjun was her own decision and it was not manav's fault .He was very angry about what had happened ...But Purvi and Arjun wanted to sacrifise so badly , no one could stop them ..I think the big problem for Manav and Archana will come from Soham .I don't think Varsha and Balan will give away Soham so easily .Maybe Balan will ask Manav for a huge amount of money to give up his son .That man has no love for Vishnu , he is just after money and Manav will give everything to get his son back .