Your mother led a corageous and fulfilling life - remember that and celebrate it for her - she was a lucky - through her own toughness - person.
You sir, - if you picked up half of her strength and by example -of how to live life - are a lucky man - not many people are fortunate enough to have good role models on how to live life to the fullest - Thank whoever you believe in, be it God or whatever, for giving you the gift of your mother for the time you had together, people that I have known through my life that have artistic talents like your mother had, can express their feelings openly and can share their love with others easily, your expression of love in this post was inspiring, I commend you for that.
I am sure that your mother's thoughts are with your brother, I personally like to believe that her soul is in a better place than on earth right now, that her thoughts are with your brother, I personally like to believe that she would wish for you and your family not to greive her passing, but celebrate her accomplishments, which as you have shown, were many,
my thoughts are with you, my prayers are for your brother..
NwBie