1. What international treaty is at the center of the case 'In re: A.P.' concerning child custody disputes?
2. What was the primary legal issue in 'In re: A.P.'?
3. What was the outcome of the court's ruling in 'In re: A.P.'?
4. What was the relationship between the parents regarding their nationalities in this case?
5. What was the father's action after learning about the child's relocation to the U.S.?