Yann Fredericks is a Hogwarts student in the same year as Albus Potter, Scorpius Malfoy, and Rose Granger-Weasley (CC1.4).
Excited about having Harry Potter's son in his year, Yann thinks that Albus's hair looks like his dad's... until Albus surprises everyone by getting sorted into Slytherin (CC1.4).
At flying lessons, only Yann and Rose are successful on their first attempt at summoning brooms up to their hands (CC1.4).
Yann has at least one wizarding parent (CC3.2).
"Up!" spell for summoning broomstick from floor to one's hand.