The bit about the four '85 older teenagers being Jonathan (dad of Katy), Sandra (cleaner), Cathal (suit man) and Shane (high Vis/'he is risen' man) wasnt massively clear.
First we discover there are witness statements that Rob now has. He tells Cassie he's one of the names (could miss this is Katy's dad if you've not properly recorded in your head Joanathan Devlin = dad in odd family). Pictures of the four statements go up (as well as a picture of the two missing children and, drumroll, Adam.
Rob/Adam can recall the older teenagers. He know Jonathan (the dad) was with the older teen girl.
Young garda interviews cleaner. Happens to mentions her name. Connection made so they know she's lying (in 2006) about knowing Jonathan.
Witness statements have the four older teenagers at the cinema that night in 85. There presence there is supported by one person and one person only. A 14 year old called Margaret. This particular Margaret it is revealed married Joanathan only a few years later. (Three or four years later, I can't fully recall. Think it was three, as i remember commenting she would have been just 17, him 21.)
Lady on scooter reveals over scones that Sandra got pregnant and went to England (aka had an abortion). Jonathan being the father. Jonathan, evidently not a quick learner the finds himself with another girlfriend pregnant. This on however wont get the boat and so they have to marry.
Older sister of Katy is the baby born from tis pregnancy.
That's all I recall and remind of talking to work colleagues.
I'm a bit vague on if they've identified Cathal and Shane. I do remember them pointing to one of the four picture of the 85 older teens, but I don't recall who they were talking about. Experienced name fatigue halfway through!!