Spruce and Chervil adopted Petronela right around the time where Beth and Dreamer were born, and Petronela took to xyr role as a big sibling immediately. Xe likes nothing more than to be helpful, to the point where xyr parents were sometimes a little worried that xe was growing up too fast. Petronela loves xyr new family more than anything, and is endlessly devoted to them.
When not bouncing around looking for any opportunity to help out xyr parents, and later also siblings, xe can be found building weird, elaborate structures out of sticks and rocks and grass in weird places in the forest. Nobody really knows if they're for any purpose, but the younger village members love to take them over once Petronela is done building. Xe doesn't seem to mind; it is pretty clear that xe is in it for the process of building and not much else.