My story (except for what happened to your dad), my body shape and even the way I dress is similiar to yours.
I started loosing weight at 18 (2010) and went from 150 kg to 111 (me being 1,92 m tall). That was the best year of my life and everything was perfect until I slowly started to gain weight again. After a certain point, everything went to hell. In the following three years (20-23) I tried as hard as I could to annihilate the fat, but failed miserably. I also lost everything - my career, my friends, my passions and as a result I've been since then completely isolated from society and reality. The only people that were there for me were my parents, whose health I seriously harmed because of the pain of not knowing how to help me.
In those three years I had the following weights :
130->170 (from 130kg to 170kg)
170->140
140->180
180->160
160->202
202->132
And that was it. As soon I started to gain weight again after 132 I completely gave up on life. Gave up the fight. I surrendered.
One year and a half later and after three failed suicide attempts (I was weighting 315 kg by then) something clicked on me. I came to the realization that at this rate I was going to die miserably in enormous pain and that no amount of food on earth would calm my emotional pain (cause by my depression and insecurities). If I died, that would be the story of my life; the story of someone that gave up, that quit, that surrendered. Someone that was destroyed by its own demons. And I wasn't gonna let them win. So I started to fight again, this time searching for new strategies.
I found out that in my country (Argentina) bypass surgery is free to anyone over a BMI of 40 (I was decided to do it anyway as soon I find out what it all was about, but it was a relieve knowing that we didn't have to do major financial efforts in order to do it). So I got an appointment with nutritionists and surgeons from my medical insurance and they explained that I could have the surgery the next month with possible complications given my huge weight or I could loose a big chunk (along with psycological treatment) and then have the surgery therefore minimizing risks. I chose the latter. 6 months later I've lost 101 kg and now I weight 214. My surgery will be in April 18 and I couldn't be happier. I don't know where you live or if you could affort a surgery, but you should try to take a look at it! It may be a solution for you, given that when we reach these huge weights and weight loss / weigh gains trends is pretty difficult to mantain the progress in the long time. I know this time you won't fail though! (I have lots of hope in you), I'm just giving the information as an advice just in case you need it, that there is another way out.
I look forward to seeing more progress pics from you around here! (I'll eventually upload mines when I gain more confidence with my body). Best regards from Argentina! (and sory for my english, I'm still working on it).