Vinnie O'Neil

Vinnie O'Neil is a bipolar man who can not live without his best friend Dylan

He is also the father of Tyler Croft

Series 1
In series 1 we see that Vinnie goes to regular doctors appointments about his bipolar, runs a weed business and does stupid things with his friends that dosen't go well. At the end of episode 3 he finds out he is Tyler's dad which is the son he shares with childhood friend Erin.