S++
Absolute core connection — family-tier bond. Irreplaceable.
S+
Deep trust / foundational relationship. Near-unconditional.
S
Trusted ally / primary support. Consistent and relied upon.
A
Reliable contact / consistent connection. Earned standing.
B++
Elevated functional relationship. Situational trust present.
B
Functional or situational relationship. Utility-based.
C
Unknown / unstable / new / hostile. Status uncertain.