"I didn’t stay - for you - I stayed for your sweets."
-- Albus Potter (CC1.3)
Albus Potter and Rose Granger-Weasley board the Hogwarts Express, with Rose determined to look for the ‘right’ people to sit with. Unlike Albus, Rose has heard the rumours about the parentage of Scorpius Malfoy and wants to instantly reject sitting in his compartment on the train. Albus, however, recognises a kindred spirit in Scorpius and decides to stay (CC1.3).
From the Web
Pottermore: Harry Potter and the Cursed Child
The theatre production opened in the West End of London at the Palace Theatre on 31 July 2016, with Sam Clemmett in the role of Albus Potter and Anthony Boyle as Scorpius Malfoy: Harry Potter and the Cursed Child, Parts One and Two