Jan
The information that you have received about having to work is completely incorrect!
Before you make a decision about claiming PIP you really need to understand the criteria which is very different from that used for DLA, in particular the mobility criteria are a lot stricter and a lot of DLA claimants are finding the Mobility award is reduced or even removed on transfer.
Have a read of our PIP Claim guide for the criteria that he will need to meet.
www.benefitsandwork.co.uk/help-for-claimants/pip Gordon