While the Samajwadi Party and Akhilesh Yadav celebrated the birthday in Lucknow, Shivpal Yadav and his Pragatisheel Samajwadi Party Lohia celebrated the occasion in Etawah.
Singh was taken to the emergency ward where the doctors began treatment.
According to sources, the BSP chief had withdrawn the case in February this year when both the parties had struck an alliance ahead of the 2019 Lok Sabha polls. However, it was not made public then.
Mayawati was addressing meeting of BSP MLAS over the issue of continuing support to the then Mulayam Singh government.
The Mercedes, according to Estate Department sources, has developed some technical fault and some Rs 26 lakhs is required for the repairs.
He said that if the victimization of Azam Khan did not stop, he would meet Prime Minister Narendra Modi on the issue.
The alliance, stitched up with Akhilesh taking the first step despite his father’s strong opposition, ended up winning just 15 of 80 seats against a prediction of 56 in the Lok Sabha elections.
After Mayawati's recent shocker over poll alliances, Congress chief Rahul Gandhi got a shot in the arm with his SP counterpart Akhilesh Yadav coming out in support of his Rafale JPC demand.
The move is an apparent setback to Mulayam's brother Shivpal Yadav who has floated his own outfit.
Yadav's speech came after Congress President Rahul Gandhi criticised Centre over issues concerning farmers, safety for women, GST and mob lynching.
2019 Lok Sabha polls: Samajwadi Party supremo Akhilesh Yadav to contest from Kannauj, Mulayam Singh from Mainpuri
Akhilesh made the announcement at a meeting of SP workers at the party headquarters in Lucknow.
This comes days after the UP government served notices to six former chief ministers, who have been occupying sprawling government bungalows in Lucknow, and asked them to vacate them in 15 days.
There is a superstition that any chief minister visiting Noida loses power and does not come back to assume the office again.
The Samajwadi Party Chief and his father were seen together at a public event in Lucknow, triggering speculation of a possible rapprochement.
Akhilesh Yadav drove over to his father's house to take his blessings, party spokesman Rajendra Chaudhary said. The father and son were together for over half an hour, he said.