Later scriptures have given geneologies to RigVedic deities who have no parentage in the RigVeda. I am asking about one rigVedic deity giving birth to another.
Indra, Agni, Vayu, Chandra and Surya were born from the body of Virata.
Rigveda 10:90:13. The Moon was gendered from his mind, and from his eye the Sun had birth; Indra and Agni from his mouth were born, and Vayu from his breath.
In Rigveda 1:164:33 Indra is said to be born from Dyuas and Prithvi.
Dyaus is my Father, my begetter: kinship is here. This great earth is my kin and Mother.Between the wide-spread world-halves is the birth-place: the Father laid the Daughter's germ within it.Rigved 1;164:33
Rigveda 4:17:4 Thy Father Dyaus esteemed himself a hero: most noble was the work of Indra's Maker, His who begat the strong bolt's Lord who roareth, immovable like earth from her foundation.