1. It is permitted to take an Interpreter / Assistant (including from one's family) during citizenship interviews under certain conditions. Pls read >
this< for the official info.
2. During my interview I had observed one senior gentleman in the next desk being assisted by his daughter.
3. The process requires you (the interpreter/assistant) to pre-notify IRCC of your visitation with the applicant. However, the required form, "
Information on Accompanying Persons and Interpreters form" cannot be found online. Nonetheless, >
here< is a member on this very forum posting the same.
4. The process also intimates "an IRCC official will require the accompanying person to fill out and sign the
Accompanying Person Declaration and Interpreter’s Oath form in his/her presence" during the interview. This suggests that this action might supersede the previous requirement, however it is not guaranteed by me.
5. I'd send a webform asap intimating my presence along with my parent and request them for any prerequisite form/format to be heeded.
BOTTOMLINE: A relative is allowed to accompany as interpreter/assistant during the interview. I've observed it myself.