
She isn't the sister of Bellesac but of the other shitty cousin.

Yeah. He is Lorel's (the 2nd oldest brother of Gallahan)son.
Laranne is his oldest daughter.
Bellesac is the son of Vieze and is a carbon copy of his shitty father. And the reason the other cousin seems to be a shitty person is partly due to Bellesac's influence who is older than him. And asserts himself as the "oldest son" among the cousins.

Shananet - Only daughter. She is the mother of the blond twins
The twins take her surname.
Vieze - Oldest son, a shitty person. as stupid and arrogant as his son - Bellesac.
He is married to the cousin of the Empress who is from an old noble family and from what Tia describes, she is a nasty snob just like her son.
Lorels - 2nd son father of Laranne and Astalieu
Gallahan - youngest son and father of Tia.

The FL's father when he notes that he is "weak-hearted".
It's because of this trait, the FL endured getting pushed around and exploited by other family members. Since she had no real protector to guide her growing up. Only a very affectionate yet overall "soft" father. He carried no real weight or authority within the family. It seems also made little effort to assert himself within the family. Which left the FL in a very vulnerable position.
yay or nay?
i wont say yay bc im not happy lol. its a promo