A condolence message is a heartfelt or sympathetic message you send to someone in a time of sadness, specifically, during the time of death.
Grieving is an intense feeling that we feel when in deep sorrow as in the event of losing someone. No one wants to lose a loved one (in this case, a brother), the resulting emotion could tear one apart and is hard for every person.
Finding the right words of condolences to offer the bereaved is difficult. There are no right words; there’s nothing you could say that will make the pain of the loss of a brother to go away, we only say what we can. However, these are short and long condolence messages you can send to a grieving person who has just lost his brother.