punar vivaah story so far 'help'

hi...i havent watched the show in a while so i was wondering if someone can tell me who the three new characters are "akash" the younger lady" and the "older lady" ...plz to reply and tell me know whats going on...thank you =)

akash is spa nd g3's son where as yash is radha and sp's son. ishita is akash's wife

sp was in love with lady named radha without making her aware abt his marriage.radha got pregnant sp denied to accept the baby .she gave birth to a baby boy
sp's wife gayatri hv give birth to a baby boy radha in order to give her baby the name of his father replaced her baby with gayatri's .so yash is son of radha and sp
akash son of gayatri and sp