I know this is a late response to @oliviaberry but here’s a glossary of acronyms here courtesy of SparkleNinja18!
LN: Sumner
DH (50): Thomas Arthur
DW (45): Teresa Deborah
-DS (20): Jaden Gregory
-DD (16): Phoebe Casey
-DD (10): Zoey Rachel
DH (49):
DW (49):
DD (26):
DS (25):
DH’s SIL/Surrogate (38):
DD (Exp):