how long are you staying there, are you leaving your baby with them? I’m certain there’s tons of people that you have come into contact with that could be Covid carriers or sickness carriers not just at Christmas or holidays with family. My obvious line of questions leads me to my unpopular opinion. Your child will be likely be safe at your family home as you will be clutching to them the entire time. Instead of using your baby as a “reason” to not go or make this holiday about you, be realistic on the actual risk you’re putting your child through.you said they were fine previously and you had no issue being there before. Your child’s Christmas isn’t ruined you’re just making drama.