Sophiegirl, I'm sorry to hear about the injuries to your brother in law.
As the previous post said, just select a pre-packaged system from a good name brand. You can also configure your own very easily with the following things in mind.
- Get the longest lasting battery possible for times away from a power outlet
- A 14 inch screen fits the bill for light weight but ease of viewing
- 2 or 3 gigabytes (GB's) of RAM memory
- don't pay extra for an upsized hard drive
- you might purchase nice headphones so he can watch dvd's and not disturb others