Unfortunately we are unable to extend invites out for children, however if you wish to bring children on holiday there is a fantastic nanny service we recommend on the island called Mallorca Nannies and have attached the link. http://www.mallorcanannies.com/
Yes as of now but please regularly check government requirements per below link. https://travelsafe.spain.info/en/
Everyone outside the EU will need a passport but will need to check respective government travel advice for their home countries. Make sure your passport is valid prior to 6 month expiration date as customs might deny your travel and/or entry.
If your invitation says “and Guest,” then yes, if not, we would prefer if it was just you since there's limited room.