I wonder if Yuzu's death caused them to not want to have another child. Now with Suika helping them come to terms with her death they might be okay with trying to conceive another one, and Suika gets to be a big sister. Since both Yuzu (orange) and Suika (watermelon) are named after fruits I wonder if they would name the next child Ringo (apple), Ichigo (strawberry) or Mikan (tangerine). That'd be adorable
