>>528836825
This is the main branch of a noble kinhouse. Noble families are usually large, but the reason as to why she has so many siblings is stated in the part on her mother.
>>528837079
meme answer would be her enchanted necklace absorbs the semen of her sexual partner and turns it into magicka for her, a bit like in F/SN. Real answer is through drinking magicka potions and absorbing spells cast at her (50 pts spell absorption)