LindaS, I only have one bathroom too so I understand. The last time I did prep, my brother was living with us, so it was me & hubby & bro with one bathroom. I told the boys that when I was prepping, if you just have to pee, go in the utility sink in the basement!

A little gross but it all worked out. Not sure if your husband and son would go for something like that, but hopefully they can hold it for a bit if nothing else.
I know when I prep, I like to have everything all nice and planned so it goes as smoothly as possible. I wear my nicest, comfiest pajamas/robe/socks. I have all my electronic devices fully charged up and loaded with games and movies. I have multiple flavors of jell-o ready to go. I have creams, wet wipes, nice smelling candles lit, nice music playing, lovely bubble bath, whatever I can do to make myself more comfortable. It does make a difference and makes a horrible time more tolerable. Good luck!