You son, will one day become a great leader like me and continue to have everything you desire in life, right in this palace. So you won't have to leave.
I must leave the palace now that I'm older, wait what's happening to him?
It's called suffering, everyone encounters it.
I didn't want to leave my family but I cannot go on not knowing the truth and living a life with suffering. I must get rid of all desires including my family to free myself from suffering and reach enlightenment.