Working from home is great but you need to have a few rules. You need to establish a place to work. It sounds crazy, doesn't it? The idea of working from home is that you have the freedom to work wherever you like, dressed however you please, whenever you choose.
Unfortunately, you need to keep your work safe from little fingers. Children love to borrow your computer to play games. Sometimes they accidently lose your work.
Even if you work on your computer, you will still have paperwork, receipts, lists and similar work related things. These need to be kept in a safe place. You won't look very professional if all your paperwork has coffee cup rim stains on it.
You also need to keep copies of phone numbers and other contact details of professional people. Don't keep your business contacts in your personal family phone directory.
Your computer is a great business tool but you should never rely entirely on it. What if there was a long power cut? You need to be able to have important information at hand, at all times.
Back up your computer regularly. Don't forget to check the backups. There's nothing worse than having your computer die and then find the backups are no good. It's not just he lost work that's a problem. You have to keep business records for tax purposes. The tax department will not accept that your computer died. They insist on you having proper records.
The ideal answer is to have a desk just for your business things. You could have a computer exclusively for business, or just password protect your work. You may want a filing cabinet. Keep all your records in the desk and filing cabinet and let the family know it's out of bounds.