He's proud to have Ranvijay as his son, because he slept with Laali? Actually I don't understand, does he know that Ranvijay only pretended to sleep with Laali or he actually thinks that Ranvijay slept with her. Becuase if he thinks he slept with her then he should be veryyy mad becuase there is no prospect of a boy in Ranvijay's life and he has just runied the chances of Laali delivering a waaris from Shekahr.
So if it is the first option, which is if he knows Ranvijay is only pretending, why does he want it?? Why not give credit to Shekhar for his baby? Why does he want Ranvijay to be called the father of the waaris?
Is it becuase he wants to end Shekhar and Laali's relationship? He has got his job done by making Laali pregant with Shekahr's baby, but for this they also married. So I think by creating this Ranvijay misunderstanding between them he wants to separate them so Laali leaves the house once the baby is delivered. I think this is a very much possible scenario.