[JINNSK]

Originally Posted by Estavali

Just curious (or rather, more than just curious), was it mentioned, in the novel, Sound Stages or anyway else, about:

1) whether Testarossa was Precia's maiden name? And

There is not any official info.
But according to the novel,she seems to have divorced her husband.(Please refer to later description)
If it is be able to assume that Mid's custom is resemble our world,Testarossa may be her naturally family name.

Originally Posted by Novel

プレシアは二十三歳で結婚し、二十八歳で一児を授かった。
生活のすれ違いから、アリシアと名づけた一人娘が二歳の頃に夫とは別れてしまったが、幸い魔導研究者は高給 であり、いくらか生活の自由もきいた。

Originally Posted by Estavali

2) if she had any known siblings (in canon, not fanon)?

.......Sorry.I can't find any info.