The Vongola generational curse of passing the Will or perhaps burden fascinates me.
Especially how it was shown in my fanfic but in curse way. But I also like the canon.
It starts with Vongola Primo and his wife whom died in his arms, leaving 2 children. One of the 2 children died and the other one live.
The child who lived received the curse of Vongola and it even went with her to her reincarnation. Her fiance died in front of her.
So this girl, met her blood relative, and this boy adores her and in the future saw her die by his own eyes and by his fault. The curse was passed to him. Soon, his fiancee died by his arms and in the dimensions they next exist.
This boy had 2 children, one created by him and his fiancee and an adopted son who also has the Vongola blood. So his adopted son saw his death, the cursed was passed onto him. This boy however wasn't able to pass or experience the curse because someone interfered and his curse was broke.
So it's like this:
Giotto > Yuki > Tsunayoshi > Luminous.
But Tsunayoshi's curse stayed with him until the last dimension he got reincarnated to. Giotto and Tsunayoshi also had the same experience of the curse.