"Whenever there is crisis before the country, 'samajwadis' (socialists) become one," he said at the inaugural session of the three-day SP national convention at Janeshwar Mishra Park here.
On his close relations with Mulayam, he said, "We don't have blood relation, but we have a relationship of ideology. Today we may be in different parties..."
Sharad said he and Mulayam had always been "good friends" and he had come to attend the convention on the SP supremo's invitation.
Though Sharad refused to comment on a possible alliance with SP, he had recently made it clear that he will make efforts to "bring together all those who were part of old Janata Parivar to fight the new political challenge".
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JD(U) and RJD, both offshoots of Janata Dal Parivar, have already joined hands to form an alliance in Bihar. In Kerala, Socialist Janata (Democratic) Party, headed former Union Minister M P Veerendra Kumar, too has decided to merge with Janata Dal (United) last month.
The unity drive in the erstwhile Janata Parivar has come after the Narendra Modi juggernaut crushed JD(U) in Lok Sabha elections in Bihar.
Without naming Prime Minister Narendra Modi, the JD(U) chief said those in government should perform and speak less and charged the government at the Centre with only selling dreams.