Hi Banished,
I'm sorry your feelings were hurt. I think its nice that you tried to do something for them. Perhaps it would be easier to ask them yourself instead of having your brother as the go between.
They may be better off financially than you and don't want you to put yourself in a hole financially buying them gifts....or there may be hard feelings.
Either way the only way you'll find out is to ask.
If you feel you want to do something for them a donation to a charitable organisation is always nice....in their name of course.
WG