"Tomorrow Lahories will elect my mother, Begum Kulsoom Nawaz, in the court of people and reject the (apex) court's decision against my father," Sharif's daughter Maryam Nawaz told her party supporters here in Model Town today.
She said the people will cast the vote in favour of Begum Kulsoom with a pledge that they will not allow anyone to insult the ballot.
A close contest is expected between Kulsoom and cricket- turned-politician Imran Khan's Pakistan Tehreek-i-Insaf candidate Dr Yasmin Rashid. There are more than 320,000 registered voters in the constituency, said to be the stronghold of the Sharifs.
The counting will begin soon after the voting concludes.
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Pakistan Rangers and the Army have been called in NA-120 that falls in downtown Lahore, where some of the most prominent government buildings and installations are located.
This constituency has thrice elected Sharif as the country's prime minister since 1990. Sharif had won the National Assembly (NA) seat from the area for the first time in 1985. He vacated it and became Punjab chief minister.
Meanwhile, the Supreme Court today admitted a petition challenging the candidature of Kulsoom, a day after the polling in NA-120.