What's the DU consensus on being absolutely silent while a baby sleeps during the day? [View all]

I'm an uncle living with my brother, his wife and a 10 month old baby whom I love to death.

Lately my brother's wife has been stressing that everyone and our two dogs be absolutely, perfectly silent every minute the baby is sleeping. I don't have a problem maintaining silence (though I don't like it much because it stresses everyone out), but the dogs can't help walking on the hardwood floors, and occasionally I have to go to the bathroom. You know, normal daily stuff that tends to make a bit of a sound. Today she threatened that the dogs have to leave (because of the walking, neither of them bark at all), and I started to think about the issue in more detail, because I'm not getting rid of my dog because she walks.

It seems to me that total, absolute silence while a baby is napping could lead to serious sleeping problems. My quick research seems to confirm it. Most people say it is far better to go about your normal daily routine and not worry about making reasonable noise. Don't blast heavy metal music, but feel free to vacuum the floor, watch TV and talk at a normal level. This makes perfect sense.

I talked to my brother about it, and he kind of agreed, but he is also defending his wife's wishes. I felt bad presenting my opinion.

Any advice?