"I was not in favour of Amar Singh joining SP again. I knew he will not be getting due respect and one should avoid...You can ask anyone I was not in his favour", Yadav told PTI.
Amar was termed as an "outsider" by SP president Akhilesh Yadav during he state assembly polls.
The Samajwadi Party (SP) had in May 2016 declared Amar Singh as its candidate for the Rajya Sabha elections taking him back to the party, six years after his expulsion.
In 2014, however, Amar Singh and Mulayam were again seen together at a function in Lucknow, after which they kept meeting frequently.
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Amar was expelled on Jan 1 this year at the SP national convention when Akhilesh became SP president.
Asked whether he would consider taking Amar in his front Shivpal said, "There is no plan as such to take him. We will take along all the 'samajwadis' (socialists), who are feeling neglected".
Holding "sycophancy and backbiting" responsible for the dispute within the family, Shivpal said, "all will be well if the family is united. There is no reason for dispute within the family. Our first priority will be to unite the family".
On his decision to form the 'Samajwadi Secular Front', which will be headed by Mulayam, SP legislator Shivpal said that it will bring the party on the "right track".
"We will constitute the Samajwadi Secular Front in July to bring the SP on the right track. We will formally announce it at a meeting in Lucknow", Shivpal said.
"SP patron Mulayam will be the national president of the front and I would be its convenor," he said.
On possibility of the Front jumping in the political arena in the future in case family dispute did not settle down, Shivpal said, "There are no elections right now. The next poll is in 2019 (Lok Sabha polls) and then in 2022 (UP assembly polls). We will decide in later stage what situation arises".