They are.

Lahan is Lakan's adopted son. In fact, he is Lakan's nephew and Maomao's adopted brother, one year older than her. Lahan respects his adoptive father, that is, his uncle, so he also cares about his daughter. He loves Maomao like a little sister and enjoys having a fraternal relationship with her and teasing her. However, Maomao's situation with her biological father, Lakan, is complex. Maomao was gathering herbs. Maomao! This is your onii-chan! Maomao looked at him coldly, as always. Sebastián was behind Lahan, looking at Mao with a soft smile.

Lahan is Lakan's adopted son. In fact, he is Lakan's nephew and Maomao's adopted brother, one year older than her. Lahan respects his adoptive father, that is, his uncle, so he also cares about his daughter. He loves Maomao like a little sister and enjoys having a fraternal relationship with her and teasing her. However, Maomao's situation with her biological father, Lakan, is complex. Maomao was gathering herbs. Maomao! This is your onii-chan! Maomao looked at him coldly, as always. Sebastián was behind Lahan, looking at Mao with a soft smile and a disapproving expression.