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You are looking at a minimum of 71% of his benefit, it may be a bit more than that, but based on his young age and that he was not at full retirement age that will be about what you will received. Also, you could likely be entitled to a lump sum death benefit as well. See: https://www.ssa.gov/planners/survivors/ifyou5.html
You need to file for the survivors benefits for them to make a full calculation on the benefit account.