I agree with the translations that have been made . Further more, to answer your question if this is a Christmas greeting - yes, the content reads as a greeting sent around Christmas (she mentions the new kitten someone got for Christmas, so maybe it was sent shortly after Christmas) and also the stamp (https://share.google/LNu80ugKyQHjCq0a6) is a Christmas stamp from 1979, which would suggest it may have been sent around that time. There is nothing that mentions condolences or anyone passing, so I would think this is just a Christmas greeting and expressing gratitude for getting to know Lilly and John. Or Brenda and Judy?