I don't even know that song, but when I read your courageous story, I wanna sing it anyway (I often do that, sing songs I don't know, my kids don't seem to mind....)
LoMe, you are a king amongst men. Your brother, while being well meaning perhaps, is being terrible. For him to tell you that you're causing your father to not learn well is simply WRONG from every perspective. They almost make it sound like you're enjoying this stuff, which your clearly not. They made some big mistakes while raising you, which put you in a world of pain, and now it is time for the family as a whole to heal together instead of pointing fingers....
Just know that waves of unconditional loves radiate from this site to you, our dear LoMe, and thanks for being so strong despite being depressed yesterday, you are a hug chizzuk to all of us!!!