When a neighbor experiences a personal loss, others can do several little things to offer encouragement. Check with neighbors who are close to them, or look in the local newspaper for an obituary or death notice for details surrounding the burial. If the time and location of the funeral and/or visitation is listed, it would mean that it would be appropriate to attend or send a gift.
When a parent dies, there is a need to grieve and mourn the loss of this significant person in your life. If the relationship were a good one, the grieving involves facing the future without the love and companionship that only a parent can provide. It means there will be one less person providing support and guidance. If the relationship were a bad one, the grieving may involve regret that a better relationship will never be able to be formed.