Is tthere such thing as a 4 way relationship?

Yes, there can be such a thing as a four-way relationship, often referred to as a polyamorous relationship. In this arrangement, four individuals are romantically and/or sexually involved with one another, typically with the consent and knowledge of everyone involved. The dynamics can vary widely, and communication and mutual agreement are crucial for the relationship to function healthily. However, the specifics can differ greatly depending on the individuals' needs and boundaries.