Mythology

Threthayuga:
Rama's children- Lava & Kusha.
Lakshmana's children- Chitrakethu & Chitrangada.
Bharatha's children- Thuksha & Pushkara.

Dwaparayuga:
Yudhistira's father- Yama.
Bheema's father- Vayu.
Arjuna's father- Indra.
Nakula Sahadeva's father- Ashwini.