Gift idea for in laws

Hi everyone, we have been living in with my in-laws since September 2018 (myself, hubs, 20 month old and 2 dogs). We are moving out and across the ocean in 6 weeks, so will only be seeing them 1-2 times per year from next year. We pay rent, and buy our own food but we would like to buy them a gift to thank them for having us! They are both in their late 60’s. Any ideas?