Hello op. Firstly, I am so so sorry for the loss of your brother. My brother committed suicide 9 years ago this December so I have some idea of how you must be feeling.
The hardest thing about suicide is trying to understand. I went through (and still do) many emotions of anger at my brother for doing it, sadness that he must have been in terrible torment to do that, guilt for not being able to help him, comfort that at least he was at peace from what tormented him...so many emotions.
You do need as much support as you can get. You don't have to be strong for anyone. You need to let yourself grieve and don't ever tell yourself you should be doing this, or should be doing that...focus on yourself and your family and get through these early days any way you can. if you need to, see a doctor. My sister took anti depressants for quite some time after our brother died and they did help her.
As people have said, you will always remember him. At first the memories are painful but for me with my brother, nine years on, mostly they make me smile. I haven't forgotten his face, smile, laugh or voice. Neither will you, yours.
I wish you all the very best. Go easy on yourself x