API relationships
From Charitylog Manual
Relationships are created using the clients endpoint, passing the id numbers of the 2 clients in the URL. An example call to create a relatiionship between person 37 and person 59 would look like:
[PUT] https://api.dizions.co.uk/v2/clients/relationship_details/set/37/59
[
{ "id": "44", "relation_first_to_second": "6", "relation_second_to_first": "5", "major": "Y" }
]