Erik de Vries and Josephine Egberts had not seen each other since their parents split up in 1999, when Erik and his twin brother moved to Belgium with their father and Josephine remained in Holland where she had grown up with their mother.
Erik had tried to track his sister down in the intervening years without success.
But their paths would cross again when Erik, who had returned to Holland to study, joined dating app Tinder and swiped through looking for matches.
The 24-year-old matched with a 22-year-old woman on the app in early April and the pair began tentatively chatting and flirting in direct messages.
