Valmiki Ramayana Bala Kanda Sarga 70 Shloka 43
Original Shlokaनाभागस्य बभूवाज: अजाद्दशरथोऽभवत्। अस्माद्दशरथाज्जातौ भ्रातरौ रामलक्ष्मणौ।।1.70.43।।
1 source checked for this shloka
नाभागस्य Nabhaga's, अज: Aja, बभूव was born, अजात् from Aja, दशरथ: Dasaratha, अभवत् was born, अस्मात् from this, दशरथात् from Dasaratha, भ्रातरौ brothers, रामलक्ष्मणौ Rama and Lakshmana, जातौ were born.
Nabhaga's son was Aja. Aja was the father of Dasaratha and Dasaratha, the father of Rama and Lakshmana.