In Type-Moon, people create a magic family lineage

"We have discovered one of the oldest families."
"Ah."
"This family has existed since the beginning of time. Its members, from ancient times to the present, include Anastasia, the last princess of the Tsarist Empire, Joan of Arc, the Protector of France, Murasaki Shikibu and Sei Shonagon, two talented women of the Heian period, and Morgan le Fay, the British witch..."
"Um--!?"
"Besides that, we discovered one more thing."
"This family has a humanoid treasure that has been passed down to this day—each generation has entered into a marriage relationship with these 'members'."
"???"
...
In the Type Moon, people get a family simulation period, and can trace back to the past to add to their own "bloodline".
But in the end.
I found out...I have become the ancestor of this family?