What it's for: turning your findings into documented research — a per-family-group narrative, and a place to confirm matches into their groups. Pick a family group in the left list (it filters), then use the two tabs.
Write a research narrative for the selected group. Toolbar:
The group's members appear with Match, Shared cM, Side, MRCA Note. Select a member, review/type its MRCA note, and either Confirm → assign to this family group or Mark as MRCA (status only). See Confirm & document an MRCA.

GDAT 4 (Genealogical DNA Analysis Tool) is a DNAGedcom tool. © DNAGedcom LLC 2020–2026. Genealogical DNA Analysis Tool is provided as is with no guarantee given as to its performance.