I explain my vampire nanny's backstory (Patreon)

Also I accidentally call him Daichi at one point but that's his dad's name - his name is Ichiro. Now here's the full gameplay explanation for those who have watched me play the sims on twitch for years:

My character, Sarah was married to Bateman (my ex irl). We had several children and one of my daughters had a daughter: Rajini. While she was a teen we had a foreign exchange student, Shingo, stay with us. Well Shingo was a vampire who grew up to marry my granddaughter who became a "Vampire Wife" influencer, eventually starting her own brand & the two of them became rich celebrities. As Shingo grew into his power he decided to marry his family (my Sim's descendents) into the powerful vampire families of the world. 

Now here's where it gets a little incestuous: Shingo married his grandaughter (my great-great grandaughter), Lilith, off to Vadislaus. Their son Wolfgang had a daughter with the evil vampire Karen (yes, she is). But Shingo's son, Yami, married her and had Ursula. So the good news is Ursula has a lot of powerful vampire blood on both sides. The bad news is that her father is her mother's great-great-uncle. Whoops.

Anyhoo Ichiro is Ursula's youngest adult son :-)