The Order of Psychologists of Quebec is very clear that therapists are not allowed to see two people who are in close proximity to one another as it creates a high potential for a conflict of interest. Close proximity are pairings such as “siblings”, “romantic partners”, “roommates”, “family members”, etc. Some reasons why the therapist cannot see both are things like:

• It can be hard for a therapist to stay “neutral” if providing therapy to both parties,
• confidentiality can be hard to maintain as it can become confusing who provided what piece of information,
• the need to keep secrets can result in a host of ethical issues.