I have a britishBritish passport and my husband and son have south africanSouth African passports, we currently live in ROIthe Republic of Ireland (ROI), and want to travel to England for the weekend to visit my sister. What visa would we need to get for my husband and son?, if any? as BrexitBrexit will be in affecteffect and we wont be able to travel visa free after brexitBrexit.