public release: 2026.08.12.1 · Schema 1.3.0
Family Fieldbook · reviewed family narratives
The Ueno twin family
A compact family story organized around the parents, the twins, and two return journeys.
01 · Member constellation
Story members
Membership is editorial scope, not proof of kinship. Every connection remains backed by an independent parentage assertion.
02 · Reviewed chapters
Family chapters
Chapters reference stable IDs; withdrawing a member, event, or relationship requires the story to be reprojected.
- 01 · pair
The parents arrive at Ueno
Shin Shin and Ri Ri's shared arrival is the institutional starting point.
- 02 · twin parallel
Born together, retained as distinct identities
Xiao Xiao and Lei Lei share birth and naming events while retaining separate profiles and four parentage assertions.
- 03 · journey
Two returns, not one merged event
The parents' 2024 return and the twins' 2026 return retain separate event identities and participants.
03 · Evidence rail
Relationship evidence and sources
Relationship status, out-of-scope dependencies, and media selection remain explicit and are never upgraded by narrative placement.
Parentage assertion
- confirmed
- Ri Ri → Xiao Xiao · father
parent-xiao-xiao-father - confirmed
- Shin Shin → Xiao Xiao · mother
parent-xiao-xiao-mother - confirmed
- Ri Ri → Lei Lei · father
parent-lei-lei-father - confirmed
- Shin Shin → Lei Lei · mother
parent-lei-lei-mother
Referenced events
- ·
event-ueno-pair-arrival-2011 - ·
event-ueno-twins-birth-2021 - ·
event-ueno-twins-named-2021 - ·
event-ueno-pair-return-2024 - ·
event-ueno-twins-return-2026
Primary source
- Past giant pandas kept at Ueno Zoo
Tokyo Zoological Park Society · 2026-05-10 - Regarding the return of Giant Panda Ri Ri and Shin Shin
Tokyo Zoological Park Society · 2026-05-09 - The names of Giant Panda twins have been decided as Xiao Xiao and Lei Lei
Tokyo Zoological Park Society · 2026-07-20 - Giant Panda Xiao Xiao and Lei Lei arrive at the Ya'an Base
Tokyo Zoological Park Society · 2026-05-10