"We moved an application before the IG, Jail for parole from May 10 to May 14, to attend the marriage ceremony of his son, which is an occasion that comes once in a lifetime", RJD national general secretary and lawmaker Bhola Yadav told news agency PTI on Wednesday.
Earlier, it was reported that Lalu Prasad had received a five-day parole.
The marriage rituals of Lalu Prasad Yadav's elder son Tej Pratap has kick-started in Patna.
Lalu, who has been convicted in three fodder scam cases by a special Central Bureau of Investigation (CBI) court in Ranchi since December previous year, is ailing and now undergoing treatment at Rajendra Institute Medical Sciences (RIMS) in Ranchi.
Aishwarya is the daughter of Chandrika Rai, a six-time RJD legislator and former cabinet colleague of Lalu Yadav.
Lalu Prasad Yadav, former Chief Minister of Bihar and Rashtriya Janata Dal (RJD) chief, was granted parole on Thursday to attend his elder son Tej Pratap's marriage ceremony.
Lalu was granted a parole on a condition that he will not speak to media.
Speaking on it, RMIS superintendent RK Shrivastava said, "Lalu Yadav's health bulletin clearly reflect that he is completely fine....he is stable and healthy".
The former health minister of Bihar, Tej Pratap got engaged to Aishwarya Rai on April 18 at Hotel Maurya in Patna. Inspector General of prison Harsh Mangla said today.