With my Gl2 I believe the

With my Gl2 I believe the LUX is aroung 4 1/2. In low light I set to aperature priority to let the most amount of light in.(Does not improve quality but makes me feel good.) When I set to aperature priority and set it at the lowest point(think it’s 1.6 can’t remember) I still can’t blur the background. Everything is in focus. I know with cameras the lower the aperature the shallower the depth of field. So can someone tell me why I can’t blur the background? I can shoot my wife’s camera with a lens of 5.6 I can blur the background out. If I use her 2.8 lens I can have 2 people standing next to each other and one person is out of focus.
Michael