What neither Jill or her father realized, was the presence of Sally and Billy behind the door. They heard the full story, but even after it's end, they hesitated before entering.
When they finally did, they saw the lupine form of their sister lying on their parents bed, with their father siting next to her, stroking her fur, wile they both cried.
For a time, neither of the kids said anything. Finally, it was the 5 years old who broke it, asking "Sis? Why are you a dog?"
That hurt the pride of Jill's wolf-side. But she knew that, due to her young age, Sally couldn't make the difference between a wolf and a dog. In fact, with their nose far less efficient than her cursed one, few humans would have been able to differentiate a tamed wolf from a modern dog. So, she swallowed said pride, and said "Not a dog, Sally. A wolf." Then, looking at her brother, she asked "How much did you hear, you two?"
"Everything since the beginning of the twin werewolves story." Answered Billy. "Beside mom and you, who else… Who else is cursed in the family?"
"Currently alive? No one else. I don't know how long ago our family got cursed, but since gramps based this tale on his own life, I suppose it mean he wasn't the first to be. And his brother became an uncontrollable monster long before he could have any child."
"How it like?" Asked the boy.
"Huh?"
"Being a wolf." Answered Billy. "How it's like?"
At this, Jill only asked back "How it's like to be human?"
That made their sister gasp. "YOU DON'T REMEMBER?!?"
"I didn't forgot how it's like, Sally. But just like you couldn't explain how it's like to be human, I can't explain how it's like to be a wolf. The only way to know it, it's to live it."
Their father was the one to ask the next question. "Does some part of your wolf-side manifest outside of a full-moon night?"
"Since the curse manifested in me, both my hearing and my sense of smell become far greater, equaling a wolf's ones. And just like I can't be human on nights where the moon is full, a new moon is the only time I can't be a wolf."
"I want to be a wolf!" Excitedly claimed Sally. "Can you make me a wolf?"
"Sorry Sally, I can't. But trust me, it's better that way. Being a werewolf if far from being as fun as it look."
"You sure you can't transmit it by biting or clawing someone? Like in movies? Because me too, I want to be a werewolf."
"Not you too!" Said an exasperated Jill. "That's not how this curse work! The next one to be cursed will be my first child. And after him, HIS first one." Seeing how her siblings seemed saddened they couldn't become werewolf, she added. "Listen, maybe it seem cool to you, but trust me, the few benefits of this curse aren't nearly enough to balance its numerous drawbacks."