You will receive other blessings such as knowing you did what you could to help a suffering child. I'm sure that they are overwhelmed with worry and it's probably just an oversight rather than a snub. I would just put it behind me, forget and forgive. One of the men I worked with lost a young son to cancer many years ago. Everyone at work did all kinds of things for him and his family and never received any thank yous. He was so overcome with anger and grief that he just couldn't bring himself to mention anything about his son. I can't even imagine what he went through and pray that I never have to.