My two sons were born in Scotland, raised in England, so their native language is English. Their mother is dutch so they picked up dutch on holidays we had over there (vacations) and when we lived there for two years. Both boys can speak Spanish - we also lived in Spain and one son is studying Spanish at uni.
They both have a great advantage because being able to speak two languages fluently and a third efficiently opens up so many doors for them. They both learnt when young so easily absorbed the new words.
Hopefully they'll have the chance to use their lingual talents when older in their jobs.