Nope, no gifts needed. But, I'm a firm believer that gifts should not be a matter of "you deserve this/don't deserve this", reciprocation, or "it's right/wrong to give gifts" but rather what you feel like giving. The with-holding or strings attached nature of many gifts is one reason why I've largely cut gifts out of my life.
You've stated that you feel they do not keep in contact with you guys much because you are critical of their lifestyle. That is their right to do so, just as it is your right to give gifts or not. If someone wants to cut off contact with me for whatever reason, I'd rather them do that than continue being made uncomfortable by my presence. I've largely cut some of my family contact off because it is deeply stressful to me, and makes me an unhappy/stressed out person. I try to keep contact with them restricted to talking about themselves, and supporting them when they find something that makes them happy. I also don't expect gifts from them. If they want to view my actions as ungrateful..that's honestly just another reason for me to keep my distance.
EDIT: Ack, that sounded really...not tactful. Not saying that is the way it is, just trying to give another perspective.