I'm thinking of "training" my disabled brother to help around the house
Whoa, are you serious? What do you mean by "training"? Do you think helping around the house is something to be trained?
Sure! I could show him how to do it and then watch him try to do it himself.
I think that it is kind to try to help your brother gain more independence. It is expected that you should help you family out in areas that they need the help in.
I don't get it but I think doing this is good for me.
You can always try to get someone to help out more, even if they suffer from a disability. Family members should at least try to help out whenever they can.