You can't understand it this way. PS is trying to use body shape to tell readers who is a boy, who is the boy's mother, or the mother's peers. It's not about using a brief introduction to tell readers about the character relationships in this story. Just like the story of the succubus!
In fact, the modeling of 'boy' doesn't necessarily have to be a dwarf, this boy can be as tall as her. Female elders do not necessarily have to be taller than boys. You can tell readers in terms of details, such as crow's feet at the corners of the eyes, some white hair, a fuller figure compared to young women, and social experience.
Just like this pair - Camilla and Gina.
I hope the creator can refer to this 2D story. If he doesn't understand, he can watch the Victoria's Secret bikini indoor photography video for reference. Passing by friends, if you have a favorite 3D or 2D creator, you can also share this idea with your favorite creator.