In plain words
Kaikeyī herself taught Rāma every branch of learning. Rāma too went on loving Kaikeyī more than his own mother Kausalyā.
Śrī Rāma keeps his father's word
For the coronation, Sītā and Rāma both stood ready, dressed in yellow silk. In the court everyone was waiting to welcome the two of them. Meanwhile Rāma went quietly to Kausalyā, “Mother! I am setting out for the forest. Give me leave to go,” he said. Kausalyā was stunned, “Why, my son? At the very hour you are to be crowned, how can you go to the forest!” she said. “Mother! It is my father's command that I live in the forest for fourteen years,” he said. Rāma held that keeping his father's word was what mattered most to him. “I must uphold the promise my father made,” he said. He bowed to his mother and set out to go to Sumitrā.
Sumitrā was Daśaratha's second wife. In those days, if anyone wished to marry a second time, he did not need the government's permission. But the first wife's permission was needed. So, before marrying Sumitrā, Daśaratha asked for Kausalyā's consent. “My lord! Our kingdom needs an heir, does it not? Marry a woman who pleases you. I too will surely take part in that wedding,” said Kausalyā. Daśaratha was very happy. “Can there be wives even this agreeable in this world!” he wondered.
Sumitrā, true to her name
Sumitrā was a woman of very great virtue. True to her name ‘Su-mitrā’, she was friendly with everyone. Sumitrā came to Kausalyā and, consoling her, “Sister! Why are you grieving? Who do you think Rāma is? He is Śrīman Nārāyaṇa Himself!