You obviously don't understand what I am doing.
I only use "Link to...." Custom Facts to document BLOOD Relationships to other people, or are part of the argument of a blood relationship. Especially children and parents, but also niece/nephew and uncle and grandson /daughter and grandparent - especially where the parent is not directly known.
I do have Custom Facts for people who may or may not be related to blood. These are ASSOCIATION custom facts
Where another person served as:
Witness to will:
Witness to marriage:
Executor/Adm of will:
Neighbor: Usually the same surname of a person / head on same page of census.
Death Record Informant:
Or, where this person served as:
Served as: (Description field: whatever)