Create a M:M relationship to Party Record (Contact, Account & Group)

Summary

Is it possible to create a M:M relationship that will effect on all Party types?

Content

Hi Experts,

I have a custom object that I need to relate (M:M) to a party record. The relationship can either be custom object to contact, custom object to account, or custom object to groups. Since Contact, Account and Groups are all party records, is it possible to create one relationship that will automatically affect all? Or is the only way is to create individual M:M relationships to contact, account & groups?

Example: Lease (Custom Object) can have multiple relationships to Contact, Account or Group and vice versa.