An attempt at an unadorned, relatively flexible family tree template with all the types of genetic relative a K-12 student is likely to have, out to cousins and great-grandparents. (2-3 siblings at each level, if they need more, scribble more somewhere. Space is finite, and this was written for students in China, who aren't likely to have more than that).
Most I'd seen were way too simple, or littered with geegaw which made impromptu additions impossible.
It occurs to me I should probably make one with more blank relationship names for more unconventional families and/or kids who prefer to recognize other relationships. That will be forthcoming.