E.M.
First off, let me say I wish your Mom all the best. I apologize for the length of this, but I don't want to forget to mention something that might help you and your mom through this tough but necessary time. I understand all of your concerns and completely empathize. It will be rough on your Mom and hard on all those around her, but if treatment is successful, then it will be totally worth all of it.
My mother was one of the first to do the interferon treatment for Hep C through the drug trials. It was a miracle for her. She had the disease for nearly 30 years before starting the interferon. Her only other option would have been a liver transplant, and due to a genetic condition that wasn't an option. When she was finished with the 48 weeks of treatment, her viral load count was zero and has stayed there for almost 7 years now. So it was totally worth it to her.
However, the pegylated interferon (known as Peginterferon alpha 2B) is extremely tough on the body - especially if your Mom is taking riboviron (Rebetol)with it - I believe the approved treatment is the two drugs administered together over a course of 48 weeks.
Interferon is a form of chemotherapy, and there are side effects to it like all chemo. My Mom lost a lot of her hair, a ton of weight, and was extremely achy most of the time. Her skin became extremely friable over and around the injection sites. Certain smells made her nauseous, and there are still foods that don't taste right to her. She lost her love of chocolate (says it tastes like styrofoam.)
You will also have watch for depression. Some people on interferon experience depression in all of its many forms. So make certain your mom is constantly talking to her doctors, nurses, and the support people at Schering-Plough - the company who produces the interferon for Hep C, as well as to you and any other family and friends she sees as support.
Schering-Plough has a web site set up specifically for the patients and family members of patients on the medication. They probably have a whole host of support suggestions I haven't even thought of. I do know there is 24/7 support available through the site and they provide a personal nurse councelor for each case. Your mom should be given the info through her doctors, but if not, she can register on the web site. - We only wish all this was around when my Mom went through it.
It will definitely be a huge help to your Mom to have you clean for her. She will most likely be exhausted for the first couple of months (possibly through the whole treatment). Just make sure what you use to clean doesn't trigger her nausea if she has any - or that you are able to clean while she is not home. Cooking is a great help, but you may find that your mom becomes a very picky eater. At one point my Mom was all about things with starch and salt. I swear my Dad kept her alive through mashed potatoes and french fries. Her doc told us to give her whatever she wanted since she was only eating about 1000 calories a day on the good days.
Bring your son to visit by all means (if your Mom is up for it) but encourage that time for quieter games. I recommend reading aloud (your Mom or you to your 4yr old) and puzzles. When your son is feeling super active, if possible have him play outside with you where your Mom can watch from a sitting or reclining postion. It will let her be a part of her grandson's life and will help keep things positive.
Amazingly, except for the weird dislike of some foods and smells still, my Mom bounced back to her normal active level very quickly after ending treatment. So while the weeks during treatment are tough, your Mom should find herself feeling pretty great when it is all over if it is succesful. If it isn't a success, watch carefully for the depression that will come with a negative result. I wish you both all the best and hope that this is as successful for her as it was for my Mom. Good luck to you both.