Topic: purchasing but hiding a game for series x/s

hi,i want to but fc25 for my child for series x/s,its on offer at the mo,but i dont want him to see we have bought it.
i cant recall,but if i purchase it from microsoft site,does it pop up on the screen when he will switch xbox on?
is there a way to hide it that he dosent see until christmas day?
thanks

It would be cool if you told your kid look for it on the Xbox store that day because the store will say "You own this game" and you fake surprise. 😁 @funkman @BowsersBuddy

@Bob_Salat ive never bought from any of those keys stores.
whats the story? are they for real?