According to one interpretation, Winston is John Wick's father-in-law.
Vic refers to him as "Jonathan" and is familiar with John's personal life. When John comes back to “life,” he is extremely nervous. He is more anxious when he needs to do mental transactions.
Will John Wick 5 be released?
Stahelski concluded by noting that there is no clear timeline for the production of John Wick 5, but that he and Reeves would be happy to continue making these films for the rest of their careers. He also stated that the future of the John Wick franchise is uncertain.

Adult upcoming movies
Is John Wick known as Baba Yaga?
The word is translated as "boogeyman", which can refer to a variety of characters. There are other elite assassins in the franchise besides John Wick, though his kill total makes him feared by many. So Baba is better suited to his personality than Baba Yaga.
Does John Wick have a real-life basis?
Marcus Luttrell, a former Navy SEAL from Texas who wrote Lone Survivor about his fire team's struggles during Operation Red Wings in Afghanistan in 2005, used the incident as a loose inspiration for the story. A yellow Labrador puppy named DASY was given to Luttrell. A firefighter on his crew.