Fun with Dick and Babs:

Dick Grayson and Barbara Gordon-Grayson are happy newlyweds living in marital bliss until one day, a young girl is dropped off on their doorstep, revealed to be Dick Grayson's child with the alien Princess Koriand'r of Tamaran. Kept a secret from Dick when Starfire departed Earth to find 'home', Mariand'r, or Mar'i was returned to Dick due to an attack on Koriand'r, which has left her presumed dead. 

Now, it's up to Dick and Babs to protect the young Mari and train her in her rapidly developing abilities while discovering the truth of her mother's disappearance and dealing with unresolved feelings both Dick and Babs have towards Dick's past and their new role as parents.