Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Several years ago, my wife and I stopped talking to her dad and her step family completely. The can be nice people, but are incredibly toxic. Her step brother is a recurring drug addict, her step sister is in her 30s but has never held a job for more than 6 months, the step mom spends money they dont have like you wouldn't believe. 
Now her father has his own issues, and is obviously the biggest connection point to my wife. But for his entire life he was always irresponsible (except for his job). He simply could never understand finances, and basically just accepted being in massive debt. He had worked on HIS fathers land as a farmer for most of his life, and pushed all the other siblings out of his life in one way or another over the years. Before his dad died, my father in law gave him this long winded speech (we were present since the grandad was on his deathbed) about signing the farm and land over before he died to ensure the other siblings wouldn't sell it off. Sure enough, right after the grandfather died my father in law sold all the land in several sales in the course of three years to pay for all the stupid expensive stuff he bought. Wife and I actually offered to buy some of it, and he said "I'm not ready to part with it yet", acting as if he hadn't already sold some. He then said "okay, I'll give you these 15 acres for $200k". Way too much for us to afford, then he went and sold it for $100k a month later to a stranger.
Fast forward several similar asshole-ish events and 5 more years, and we simply dont talk to him anymore. Pretty much acting as if he doesnt exist.
Since the holidays are happening, he contacts my wife and essentially asks "what happened?".
We havent ever given him a specific reason why we dont talk to him. Quite frankly, there was never one reason why, and I feel like if we were to have an honest conversation with him it would consist of hours and hours of pointing out all the obviously shitty things hes done in his life (to and around us).
TL;DR - Oblivious Ass father-in-law doesn't realise he's an ass. Should we tell him why or just continue the silent treatment?

not talking to my father-in-law for years and not telling him why