Help them pack. People that don't travel a lot don't realize how much luggage they can do without. Especially when you are traveling from town to town, and changing from hotel to hotel, or worse, on and off trains. Luggage, especially when it is more than your parent can move by themselves, should be kept to an absolute minimum. Now go show your parents how much you love them.
Nothing is wrong with wanting love to be returned.
However when you feel that you have all the love that you need, feel completely loved, giving becomes even more satisfying.