Responses
I guess the father didn't like that his wife using his brain....according to his behavior with the current queen.
So probably the uncle's plan was when his sister's kid(the prince) dies, the king will divorce or stop seeing the queen since she is heirless n the uncle can have all the time of her life to console his sister. （/TДT)/
His father killed his mother so he could move the new queen into her position. His father is the one who pushed him aside for the younger prince. His father instigated all of it