Chief Minister Yogi Adityanath wished the veteran leader on his birthday with a tweet and wished him a "healthy, active and happy life".
The event though once again threw wide open the split in the party and the family.
While the Samajwadi Party and Akhilesh Yadav celebrated the birthday in Lucknow, Shivpal Yadav and his Pragatisheel Samajwadi Party Lohia (PSPL) celebrated the occasion in Etawah.
Both the parties put up hoardings wishing Mulayam Singh on his birthday in the state capital.
In Lucknow, Akhilesh Yadav led the celebrations with his cousin Dharmendra Yadav and all senior party leaders by his side.
Mulayam Singh Yadav arrived at the party office in the afternoon and cut the customary cake amid cries of 'Mulayam Singh zindabad'.
Earlier, the Samajwadi Party workers had held a 'havan' to pray for the their patriarch's long life.
Party leaders distributed 81 kilograms 'laddoos' and danced to the beating of 'dhol' at the party office.
In Etawah, Shivpal Singh organised a 'dangal' to mark the occasion. It may be recalled that Mulayam Singh had been a wrestler in his younger days and is particularly fond of the sport.
Shivpal Yadav also released an e-book titled 'Lohia-Mulayam.com' o the occasion.
However, none of the other family members attended Shivpal's event showing that the divide within the family was equally deep.
PSPL members celebrated Mulayam's birthday at all district offices by cutting cakes and distributing fruits among the poor.
Mulayam Singh first became Chief Minister of Uttar Pradesh in 1989 and then again in 1993 and then in 2003. He served as Defence Minister in the Deve Gowda government in 1996.
He is the founder of the Samajwadi Party that is now headed by his son Akhilesh Yadav.
He is presently Member of Parliament from Mainpuri.
( With inputs from IANS )