Five-month-old tracey is more easily soothed by her dad; she smiles and looks more at him than at others. still, when aunt corrie comes for a visit, tracey has no problem giving her a cuddle. tracey is in the phase.

Based on the description, Tracey is in the Attachment-in-the making phase
Attachment-in-the making phase is the phase in learning development when an infants began their bonding process with whoever takes care of them the most because the infants see that person as a protector that's important for their survival.

They went to leyden, holland