Ravana's son Meghnad got the name Indrajit by defeating the gods of Indra in the heavenly world. Indrajit was the only warrior who possessed the trinity of weapons Brahmastra, Vaishnavastra and Pasupatastra.
Sumitra's sons Lakshmana and Shatrughna were twins. Rama is the seventh incarnation of Lord Vishnu while Lakshmana is an aspect of Adisesha. Bharata is Sudarshana Chakra aspect while Shatrughna is Shankh aspect.
Ravana disguised as a hypocrite monk took Sita by force and kept her in Ashoka Vatika in Lanka and kept demon women to guard her.
Ahalya's husband Sage Gautama sees her with Devendra and curses her to turn into stone. In the Treta Yuga, Lord Vishnu incarnated as Rama and told her that by touching his feet she would get rid of the curse.