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RIO DE JANEIRO - Flavio Bolsonaro may cut a more affable, measured figure than his fiery far-right father, but he has taken pains to insist that the Bolsonaro name, and all it represents, runs through his veins.
At the right angle, the resemblance between Flavio Bolsonaro, 45, and his father, Jair Bolsonaro, is almost jarring.
With fewer rough edges and a jovial smile, Flavio easily inherited his father's powerful conservative base while winning over less ideological voters who are fed up with Brazil's leftist President Luiz Inacio Lula da Silva.
This gave him a shock lead over Lula after the first round, sending him into Sunday's runoff as a narrow favorite.
"You will see Jair Messias Bolsonaro place the presidential sash on his own son," Flavio told a crowd of over 70,000 supporters in Sao Paulo on Sunday.
The senator has vowed to free his father, who is serving a 27-year sentence under house arrest over a botched coup attempt after he lost a re-election bid to Lula in 2022.
"I may be calmer, more prone to smiling, more relaxed and moderate. But I have the blood of a Bolsonaro in my veins," said the senator, who is often referred to only as Flavio.
Despite his absence, Jair Bolsonaro has loomed large over the campaign, with his image appearing on T-shirts and posters at rallies.
"Come back Bolsonaro!" chanted the crowd in Sao Paulo on Sunday.
After the first round, Flavio Bolsonaro related that his father was delighted with the results and "very happy to have been heard by the majority of the Brazilian people".
Funk and fury
Born in Rio de Janeiro state, Flavio Bolsonaro is the eldest of the former president's four sons.
Cementing the family political dynasty, Jair Bolsonaro's second son Carlos was elected to the Senate, as was the former president's wife Michelle. His youngest son Jair Renan was elected to the lower house of Congress, as was the former president's brother.
Flavio Bolsonaro has two daughters with his wife Fernanda, a dentist, and presents himself as a devout family man, saying "God is using me to save Brazil."
He was elected to the Rio de Janeiro state legislature at age 21 and became a senator at age 37. He holds a law degree.
On the campaign trail, Flavio Bolsonaro displayed the relaxed Carioca style and language that the city of Rio is known for, dancing to funk music along with young right-wing influencers.
During his only debate with Lula so far, the president described Flavio as a "Carioca hustler".
It emerged during the campaign that the senator was under investigation for alleged corruption and money laundering linked to the financing of a biopic, "Dark Horse," about his father.