First, don’t take your SS early! It permanently reduces your benefits significantly. Please wait until your full retirement age. That higher base amount will also be the base for future inflation increases.
Social Security allows you to claim both a retirement and a survivor benefit at the same time, but the two won’t be added together to produce a bigger payment; you will receive the higher of the two amounts. You would be, in effect, simply claiming the bigger benefit.
And since as a widow you will only get half of his benefit OR your own low benefit, you lose both ways if you take your SS now!!