What do you remember about your father?

He was cold, calculating, never told me he loved me, never even told me he liked me...

My father was an extremely terrible man, you see? ......He was a man who could only show off his own power by hating and causing pain. He would assault me for any reason, or no reason, so I knew how to forget pain from before  could remember.  .

Thad lost every part of the respect he  was brainwashed to have for his father. They didn't care about each other. His father never regretted the pain he gave his son. Thad wanted to tear him apart. When he was lucky enough he killed Eobard's time remnants. Knowing nothing short of a miracle could get rid of him.

He never went easy on me! Every day of training was a beating. 

All my life, my father trained me to be a killer, an assassin like him. 

Leaving him alone for long periods at a time making sure Thad never even thought about leaving. Giving him nothing but the husk of a computer for company,.

This is a crutch!" "This makes you weak!" He told me I could have it back when I was strong. So I got strong, but I never got it back! I've had to work harder than anyone to get where I am. 

Taking away certain things Thad began to treasure, forbidding certain actions or tricks Thad wanted to use.

Eobard:  that was not my fault!
Thad: Not your fault? Who filled my head with dreams? Who drove me to train until my bones cracked? Who denied me my destiny?!

Manipulating every action in the past for his plan.

Manipulated, hurt, abused, left alone. Desperate for praise or to not feel pain at all. The one thing that's made him hate Cisco Ramon is that Eobard treated him more like a son than he ever treated Thad.  Loyalty turned to hatred as he remembers every little thing

Thad: I should have killed you.

Eobard: Yeah? I should have killed you.

Thad: I wish you had.

(As if he was stating facts.)

I will hunt my father like a dog, and I will tear him apart slowly... piece by piece, until he knows some semblance of the profound and unceasing pain I knew every single day.

Barry: Your Dad hated that.
Thad: Well, he hated children too, but he had me.

I'm gonna tell everyone in prison I went back in time to kill my own father!

(Going after his fathers past self..)

I can't believe I got shanked by my own father.

Thad referring to his fathers death after crisis. Looking for knowledge he would've known or ask a question.

 I just can't call Dad in the afterlife and be like, "Dad, could you stop playing tennis with Hitler for a moment, and take a quick call?"
(

Thad brought back to life just to serve as a new body for Eobard to possess.)

Eobard: It seems I erred in restoring you to life, my son.
Thad: Restoring—? You mean desecrating me, do you not, father? You stole those cells from me in life— and warped them to make a shambling mockery of me in death. No more, father... Your cursed voice will be still!
Eobard: But, youth, I merely—
Thad: Still, I say... Your tongue could seduce a planet of priests, Eobard ... But not your own son.

https://youtu.be/_-eHOOlljD0

Do you know how hard it is to trust people? When your whole childhood was bullshit and manipulation?