Their child would be 1/4 human, 1/4 vampire and 1/2 werewolf, which would make them a threat to the Volturi. Renesmee is fertile as she is 1/2 human. The only aspect of herself that is a vampire is that she'll never age after she matures and she drinks blood.
Fans know, in the end, Jacob and Renesmee do live happily ever after together, along with Edward and Bella.
Jake is human with shape shifting tendencies (he's not a lycan/werewolf, he's a shifter). Renesmee is human with vampire tendencies (she appears to be human but loves blood). Edward explains vampirism as an evolution of some type, so Renesmee would be one of these evolved humans. Their children would be human.
While Jacob insists his feelings for Renesmee (Mackenzie Foy) will remain completely platonic until later in her life (as does Twilight author Stephenie Meyer), Bella (and most of the fandom) find their relationship to be unsettling at best.
The Twilight 6 Saga: Midnight Sun - Trailer (Renesmee and Jacob)
Although Edward and Bella tell him that Renesmee is an orphan that they've adopted, he discovers their biological relation when he looks into her eyes (which he recognizes as his own), but decides to stick to the adoption as their public story for their safety.
She is the resident vampire/human hybrid of the Olympic coven. She is the wife of Jacob Black who imprinted on her and the mother of Evan and Sarah Black.
Jacob Black is Renesmee's husband and imprinter. He imprints on the infant Renesmee in Breaking Dawn.
Seeing as she's half vampire, one would think she would age much slower than humans, since vampires can't age at all. However, poor unloved Jacob shouldn't have to wait eighteen years for his happily ever after, so Renesmee grows abnormally fast, and will magically stop aging once she reaches sexual maturity.
By imprinting on Renesmee, Jacob has imbued her with protection from other werewolves in his tribe. Prior to taking her on as a romantic partner, Jacob would first act as an older brother to Renesmee until she grew up – which won't take long given her hybrid nature, which makes her age more quickly.
He does but in a different way. Once he imprinted on Renesme, the love he had for Bella shifted to her child. The whole philosophy behind his love for Bella was for him to stay connected to her bc of her child. Renesme was the reason his love was so strong and unwavering.
At the end of the book Nahuel, the human-vampire hybrid the Cullens have just met, states that she will probably reach complete physical maturity around seven years after birth, physically appearing to be around sixteen or seventeen years old, at which point she will stop aging and live to an unknown extent.
At the end of Eclipse, she becomes engaged to Edward Cullen, and they marry in Breaking Dawn, one month prior to her 19th birthday. On their honeymoon, she becomes pregnant, and, due to the peculiar nature of her baby, Bella nearly dies giving birth to their daughter, Renesmee.
Jacob was initially in love with Bella, but she chose Edward and gave birth to Renesmee, a half-human, half-vampire hybrid. As part of the imprinting, Jacob will only be a brother figure to Renesmee until she comes of age, by which time she may develop romantic feelings for him, and vice versa.
So I was watching Breaking Dawn part 1 and realized Bella's pregnancy is 28 days long.
Renesmee Carlie "Nessie" Cullen (/rəˈnɛzmeɪ/ rə-NEZ-may) is the dhampir daughter of Edward Cullen and Bella Swan, born on September 11, two days before Bella's nineteenth birthday in Breaking Dawn.
The venom, Stephenie writes, is what helps Edward impregnate Bella in the fictional book. According to Stephenie, the normal reactions of arousal are still present in vampires, made possible by venom-related fluids that cause tissues to react similarly as they do to an influx of blood.
Renesmee will eventually reach an age of maturity and stop growing, just like Nahuel, but she does have some time of growing left. Vampires are not used to growing, but Renesmee's aging process is much faster than a human's.
Why did Jacob believe that Bella had died after Renesmee's violent birth? The pull toward Bella he had been feeling was suddenly gone. What "secret" about her transformation did Bella want to keep from Edward? The morphine had not helped the pain but had only kept her still and silent.
In the Twilight series, Jacob imprints on Renesmee when she is just a few weeks old, while he is around 16-17 years old. Therefore, there is an age difference of approximately 16-17 years between Jacob and Renesmee when he imprints on her.
One character from The Twilight Saga who became an unexpected fan favorite is Charlie Swan, Bella's father, who by the end of the books and movies had no idea his only daughter had become a vampire – and here's why.
The Volturi reach Forks intent on killing Renesmee and the Cullens. However, the Cullen family members gather witnesses from around the world to prove that Renesmee is not an immortal child.
Charlie Swan and Sue Uley Clearwater entered in a relationship in Breaking Dawn, and are presumably two of the last characters to do so.