Need gift ideas

So my husband, my son and I were pretty much given a free vacation to the beach by my parents, and we have a couple of family members (my brother, his fiancé and my mother-in-law) who are checking in on our cat while we are gone. We don’t have a lot of money, but we want to thank my parents for the trip and the family members who are watching our kitty. Any ideas would be helpful! Thanks in advance for the tips!