Christopher Mayfield, Jr., 5, and Braylon Mayfield, 2, both died in their sleep at their home within weeks of each other.
Braylon's death was three weeks ago and authorities, who do not suspect foul play, are awaiting autopsy results for some clue as to why he died.
Then Wednesday afternoon, while napping on the family sofa, Christopher, Jr. died. He had returned earlier in the day from summer camp.
No foul play is expected but the cause is a mystery at this point.