MARIETTA – (WAOK/AJC)  -  Marietta police say they have one man in custody after a woman was found stabbed to death in her home on Monday.    It happened in a neighborhood off of Barrett Parkway in the 2600 block of Ashley Drive.  Investigators say the man being questioned is the woman’s son,   and that two other siblings are assisting officers with the investigation.    Officers are not releasing the family’s name,  and it’s unknown who found the woman dead.