Eddie bakes 3 x 7 = <<3*7=21>>21 pies for 7 days.
His sister bakes 6 x 7 = <<6*7=42>>42 pies for 7 days.
His mother can bake 8 x 7 = <<8*7=56>>56 pies for 7 days.
Therefore, they are able to bake 21 + 42 + 56 = <<21+42+56=119>>119 pies in 7 days.
#### 119