Couples counselling is language that is exclusionary of many relationship types that may look for relationship counselling such as parent/carer-child, co-parents who are separated/divorced, friendship counselling (which has been increasingly popular!), poly / multi-partnered relationships (in dyads/parts or in whole), and sibling relationship counselling – just to name a few I’ve seen!
It might not make my marketing / SEO for my google results but it aligns with my ethics.