Originally Posted by
theddo
As far as I can tell he was offered to stay (in a facility) until his admissibility was determined and elected to not do that and return to his country of departure without any possibility to challenge that decision later on.
"As far as [you] can tell" would be a different matter if aware of the functioning of law in this area.
Even after denial of entry/readmission, an EU permanent resident jailed for day after day after day doesn't lose all possibility to challenge the decision of the EU government agent(s).
Did you make up the following situation, or are you sure that the following is all that happened?
Originally Posted by theddo
Saying well, I have a copy of my dad's residency card later on probably doesn't make a difference.
As a matter of fact, how someone became a permanent residence in an EU country and who else in their family is a permanent resident is a factor in admissibility rights in this area.