This question already has an answer here:
My wife is a naturalised UK citizen from Gambia. Her brother is 17 and in Italy with a Permesso di Soggiorno.
- Would he need a visa or would he be able to join us in the UK immediately?
- If he arrived in the UK with the residence permit and a Gambian passport and evidence that they are brother and sister would he be allowed in?
- Would he be allowed to board an aircraft in Italy without a visa stamp in his passport?
We are trying to do it quickly before he turns 18 in July.