CBI 209.51
"eligible child" (enfant admissible) means a member’s, their spouse’s, or their common-law partner’s child — including a stepchild, legal ward, adopted child or child adopted under a Canadian aboriginal custom adoption practice — who is dependent on the member because the child either is under 18 years of age or is mentally or physically disabled.
"immediate family member" (membre de la famille immédiate) means:
a. a member’s spouse or common-law partner;
b. a member’s, their spouse’s, or their common-law partner’s child — including a stepchild, legal ward, adopted child or child adopted under a Canadian aboriginal custom adoption practice — who is dependent on the member;
c. a member’s, their spouse’s, or their common-law partner’s father, mother, brother, stepbrother, sister or stepsister; or
d. a person who stood, prior to the member’s enrolment, in the place of the member’s, their spouse’s, or their common-law partner’s father or mother.