BBC reports its the mother and sister of Shannon's stepfather.
Police have arrested two members of Shannon Matthews' family over the schoolgirl's alleged abduction.
The nine-year-old disappeared on 19 February and was found less than a mile from her home in Dewsbury, West Yorkshire, three weeks later.
Her stepfather's mother Alice Meehan, 49, and sister Amanda Hyett, 25, were arrested on Friday.
Shannon's stepfather's uncle Michael Donovan, 39, has been charged with kidnapping and false imprisonment.
Ms Hyett was arrested on suspicion of assisting an offender.
Ms Meehan was arrested on suspicion of attempting to pervert the course of justice.
