default of inclusion

The primary objective is to evaluate the experience with the information received on the disease by the healthy brothers and sisters of childrens with malignant haemopathy at the Centre Hospitalier Régional et Universitaire of Lille

Inclusion Criteria:

• Children from 6 to 12 years old
• Brother or sister of a child:

O has malignant haemopathy O follow-up in the pediatric hematology department in Lille, O diagnosed from 6 weeks to 1 year before maintenance of the healthy subject included

• whose parents are able to understand and sign voluntarily informed consent
• Affiliated to a social security scheme
• Ability to understand and answer questions alone during the semi-structured interview

Exclusion Criteria:

• Child under 6 years or over 12 years
• Subject with a pathology that may interfere with the course of the study, according to the investigator's assessment
• Absence of the informed consent of one of the parents and / or the legal representative
• Refusal of participation of the subject