John and Elizabeth were parents to eleven children, he would outlive five of them. The three son who did survive their father were Edmund, William and Richard all would suffer due to their Yorkist blood and all would try their best to oust the Tudor king, but as you probably know they were unsuccessful.
On the 29th of April in 1450 at Wingfield John's father prepared himself for exile, in doing so he wrote a heartfelt and moving letter to his eight year son.
You can read this here:
meanderingthroughtime.weebly.com/wars-of-the-roses-blog/true-and-ever-loving-father