probably
It is generally a good idea to have a passport when traveling. US citizens may enter the Dominican Republic without passports using other forms of ID and this is also true for children.
A passport.
No
No
yes
Yes, they do.
Yes, even children need passport to travel. Especially when it is international.
British and Irish citizens (but not British "nationals" from Hong Kong or other places overseas) can fly within the British Isles with a photocard driving licence.Other EU citizens can use their national ID card.Everyone else still needs a passport.
US citizens cruising to and from a US port do not need a passport.
Yus.
yes
You need a passport or an identity card (for EU citizens).