ANSWER:

You are not his mother! You must not force him in learning duaa that are not mandatory. You can only advise him when he is in good mood as such person might get away from what they are already following. Find out some other ways diplomatically to recite in front of him so that his interest increases towards this, however it is not mandatory upon anyone. 

My husband doesn’t know the duas that we does in salat and he always perform 5 salats on time. When I came to know about this I asked him to study duas and also he doesn’t know ayat ul Kursi etc .Some times we had fight on this topic .I asked him to study and he behaves like he is doing it Only for me and he is not ready to study this but I still forces him .What can i do now ?