Originally Posted by
stifle
Officially speaking, non-EU citizens who are travelling with an immediate family member that is an EU citizen may join the EU line in any country other than the family member's country of citizenship, and is similarly exempt from visa and in due course ETIAS fees. If travelling to the country of citizenship of the EU citizen, domestic rules of that country apply.
And depending on the country, they'll still let you though the EU line with the foreign spouse. Annoyingly, the ETIAS fee will apply if you want to enter the family member's country of citizenship. The fee-waived one is not vaild for that one single country. Go figure.