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MANILA - There can only be one Estrada in the Senate, according to Senator JV Ejercito who admits he may have to reconsider his plans to seek re-election in 2019 if his half brother, former Senator Jinggoy Estrada, decides to run for the same position.

Speaking to ANC Wednesday, Ejercito said if his half-brother, who just got out of detention last year, intends to seek a Senate seat, they will have to seek the advice of their patriarch, former President and now Manila Mayor Joseph Estrada.

"Only one should run. I don't know how these things will be resolved. But these are challenges. I will still stick to my principle that only one has to run... Probably the decision of my father would matter. But personally I would want to continue," he said.

The rift between the brothers has been highly publicized since Ejercito was elected mayor of San Juan in 2001, succeeding Estrada. Things went bad to worse when Ejercito signed a 2015 Senate committee report recommending plunder charges against Estrada.

Although they are still not in good terms with each other, Ejercito and Estrada united when the family faced the Zamoras in the 2016 polls. Ejercito's mom, Guia Gomez, was elected mayor, while Estrada's daughter, Janella Estrada, was elected vice mayor.

Ejercito, meanwhile, won a Senate seat in 2016, while Estrada was detained due to graft and plunder charges in connection with the "pork barrel" scam. Estrada was released from detention in 2017 after posting P1.33-million bail.