Mrs Srisakul wrote on her Facebook page that this was the second bomb attack on her house in the Phutthamonthon area.
"The grenaded landed in the yard next to the dining room and I was inside the house at the time.
"I don't know how many more grenades will be fired until they are satisfied, but we [the PDRC] will fight to the end," Mrs Srisakul wrote.
On March 11, two grenades were fired from an M79 launcher close to her house but failed to explode.
PDRC spokesman Akanat Promphan, a stepson of Mr Suthep, wrote on his Facebook page that his family was safe and they were still giving more than 100% in the fight against the caretaker government.