Yes, it's best if siblings are aware of the situation. It's helpful to explain what an eating disorder is and, as much as possible, prepare them for the changes that may arise as a result. These explanations should always be adapted to the age and level of understanding of the sibling.

Hiding what's happening isn't advisable. It's important to talk about it openly and establish good communication within the family to foster healthy emotional development. Professionals can advise you on these aspects of communication and relationships with siblings.