First of all, talk about the relationship between White Snake and Xiaoqing. Xiaoqing was originally a green snake who practiced for 800 years. Xiaoqing was actually a man at first. Later, when Xiaoqing met the White Snake, she wanted to possess the White Snake. As a result, the White Snake is actually a thousand-year-old snake demon, and her practice and mana are far above Xiaoqing, so the White Snake quickly subdued Xiaoqing. Xiaoqing volunteered to accompany the White Snake as a daughter. Because the White Snake wants to repay Xu Xian, Xiaoqing pretends to be the handmaid of the White Snake and accompanies the White Snake to repay her kindness. But from the daily life of Bai Niangzi and Xiaoqing, we can easily find that they are actually sisters. After all, Xiaoqing doesn't need to do what maids do.
Secondly, let's talk about the relationship between Hu Meiniang and Cain. In fact, the mode of getting along with Hu Meiniang and Cain is to copy the mode of Bai Niangzi and Xiaoqing. When Hu Meiniang got the portrait of the White Snake Empress, she became the White Snake Empress. Hu Meiniang wants to go to Xu Shilin after she gets a beauty. Although Cain didn't support Hu Meiniang going to Xu Shilin, she wanted to play with Hu Meiniang, so Cain followed Hu Meiniang. After Hu Meiniang and Cain came to this world, in order to live like ordinary people, he bought a small manor and opened an embroidery room, and Hu Meiniang became the proprietress, so Cain had to be a maid to accompany Hu Meiniang.
Although to outsiders, Hu Meiniang regarded Ayane as a servant girl, but Hu Meiniang actually regarded Ayane as his sister, so after King Ba Jin caught Hu Meiniang, Hu Meiniang also advised Ayane, who had come to rescue himself, to leave and leave her alone.