how to take a picture inside in low light, without flash

This picture was a quick snapshot. I didn’t want to miss the moment. My little boy was reading to his daddy in the morning. It was a story in bed and it was just so sweet. So there was no time to change the lighting. The windows were closed and that’s how they had to stay if I wanted to capture the moment. The overhead tungsten light was on, but that’s okay, that’s normal inside.

My manual settings for this shot:
ISO – 6400 (fortunately my camera has a pretty high ISO range. I can go up to 6400 to help with dark settings. It gets a bit grainy but not too bad.)
aperture – 2.2 (remember it was a darker room at the moment so I was looking to let in light, so I opened my lens up more to let in more light)
shutter speed – 1/160 second (again, wanted to let in as much light as possible, could have maybe even gone a little lower/slower shutter speed since they were sitting still… 1/125 or 1/100 would’ve probably worked)