Martha may not be Debbie's Biological mother but having raised her by herself as Debbie's mother was too busy with work, Debbie treats her as such. Then when Debbie moved out she got married, she then had Brad and just after Nora was born their father passed along with Debbie's mother. Martha having adopted her nephew Jordan as her brother and sister- in-law had also passed and Martha moving in with Debbie and watching the kids while Debbie works. #niftyknitting