you have your WiFi password to hand. Offer them access to your network, and hope that everyone adheres to good festive netiquette.
Christmas is the perfect time to make a video call, but choose your timing carefully. Nobody wants to be talking to virtual visitors during lunch or present opening.
Remember the power of the written word.
If you are the lucky recipient of a generous present or lavish hospitality, then hand-writing a proper thank you letter is a much more elegant gesture than texting or emailing, and will be noted and appreciated. It is fine to email or text your thanks for small presents.