I am so sorry for your loss, but treasure the good memories and give your self time to grieve.
My father is still fighting this beast but we do attend a monthly brain tumor support group and their are patients, caregivers, and people whose loved ones have already passed and it is so helpful. I think it gives me strength to get through the rest of the month being with people who truly understand exactly what your going through and the people who have already had to go through the grieving process still attend years later and they say it helps them too. I can't say enough good things about our support group, they always seem to know the right thing to say to help me through whatever part of the roller coaster we're on at that time.
God bless you and your family.