First, the relationship between husband and wife. This is the most general inference that the seven fairies are their daughters.
Second, the relationship between colleagues has a lot to do with it. The Queen Mother is regarded as the "Queen Mother of the West" and the ruler of Kunlun Wonderland on the ground. The Jade Emperor is the leader of heaven. They are colleagues, just like two department managers of a company. The Queen Mother of the West is the god of Pangu's descendants, as well as Nu Wa and Jiutian Xuan Nv, while the Jade Emperor is the god of Taoism, and should be the gods of two different races and categories.
Third, brother-sister relationship. There is a TV series called "Running to the Moon", which arranges the Queen Mother and the Jade Emperor as brother and sister, and the Jade Emperor's wife is Tianhou.
Fourth, the mother-child relationship. The Empress Dowager, as its name implies, infers that the Empress Dowager is the old mother of the Jade Emperor.
A relatively authoritative statement: among the orthodox Taoist gods, the Jade Emperor and the Queen Mother are not husband and wife, but the first of all female immortals, who are in charge of the Kunlun Fairy Island. Dong is in charge of Penglai Fairy Island, and he is the first male fairy. The Queen Mother is also called the Queen Mother of the West. It seems that she and Dong are a couple. As the head of the immortals and the Lord of the gods, the Jade Emperor should be a higher-level immortal than the Queen Mother of the West and Dong. The marriage of the Queen Mother and the Jade Emperor only appears in China folk stories and legendary novels. For example, Wu Cheng'en's Journey to the West, such as Lotus Lantern. The most influential in history should be the folklore "immortal couple". The Jade Emperor and the Empress Dowager were not only legal couples, but also gave birth to seven beautiful daughters. In the heaven with strict etiquette, if the Jade Emperor and the Empress Dowager are not husband and wife, the heaven is unacceptable. Marshal Tian Peng was driven out of heaven and turned into Pig Bajie just because he had wild desires for Chang 'e. If the Jade Emperor and the Empress Dowager don't have legal husband and wife coats, how can they sit firmly on this throne?