My heart goes out to you and your family.
It seems as if you found a positive way to grieve and remember your brother, but your father, bless his heart, has not.
It's difficult for parents to deal with the suicide of their children; they often blame themselves, although they sometimes become angry and blame others who were close. If they never find a way to let go or to forgive, the anger can become rage and it can destroy them.
When someone finds a person who has just taken his or her life, that adds another dimension to the trauma, one that sometimes requires professional help to deal with.
It is too bad that your father has not been able to get the help he needed. He has to want to change, and he may not want to. In a way, you lost your brother and father both that day, so you have two people to mourn.
You said that your father does not speak to you. Do you ever see him? IF so, does he let you give him a hug? Hugs are simple, but they can sometimes help.