It's not entirely clear why the Dutchman has acceded to the move. A club source at Old Trafford told the local paper, "There's quite a bit of surprise about it. You would have thought that if they were going to be with anyone it would have been United."
Relations between Van Persie and the club have appeared strained in recent weeks, and Jamie Jackson of The Guardian highlighted some of the veiled criticism he has levelled at some of his teammates.
Van Persie's own form has suffered too, as noted by Squawka:
Simon Mignolet completed the same number of passes (12) as Robin van Persie today.— Squawka Football (@Squawka) March 16, 2014
Top scorer in the Premier League during the last campaign, his contributions have been well below par this term, and he continues to be far from the player of 12 months ago.
The news that he has allowed his son to train at the City academy, rather than United's, will surely drive a bigger wedge into a relationship that has appeared in jeopardy for a while. Whilst there is no suggestion that Van Persie himself will follow suit, such actions are hardly likely to curry favour in the Old Trafford corridors of power.
In a separate twist, ex-United star Phil Neville, now one of David Moyes' first team assistants, has also allowed his 11-year-old son Harvey to represent the blue half of Manchester at youth level.