Covid, Christmas, elderly relatives

[oxblood]

I know that there is no longer supposed to be any differentiation between Covid and other viruses, coughs, colds etc. But I'm interested to know what you would do in this scenario.
Friend has just today tested positive. I saw her socially on Sat and Sunday. Spent 2 hours in a car both days travelling to an event.
We are hosting Christmas Day, relatives who are older and somewhat vulnerable in various ways. We are also planning to have an elderly relative over on Xmas Eve who is definitely vulnerable.
Would you tell them and let them make their own decision, even if we feel well and have no symptoms?
Or keep quiet and just have them over as long as we are all feeling fit and well, just as we would with any other illness?
Any thoughts gratefully received because I really don't know what to do for the best!

I'd forewarn them now, just so they can make preparations re food just in case. If you haven't got any tests, get some in and tell them you'll let them know if you feel unwell before and will test immediately before they'd travel to meet you. Ever since covid, my elderly Mum won't visit anyone who has cold symptoms.

Even if visitors are happy to come if you're positive, you also have to plan in case you don't feel well enough to host (only had it twice, but I certainly wasn't up to doing much more than an shower, warming soup up).

Mmm tell them now or tomorrow at the latest then they can have a think about it and if they have a change of heart have time to make some sort of contingency plan if they decide to rather than leaving it any later.

I am vulnerable I would want to know and would feel annoyed and upset if someone I knew and cared for knowingly gave me covid.

I would let them know, but I would also test in the run up to Xmas so you can let them know if it's negative. It's probably a good idea to test before Xmas anyway if you're hosting vulnerable people, since there's so much covid around.
There's a good chance your friend wasn't positive yet at the weekend, especially if she didn't have symptoms.

10 days was the outermost limit of the incubation period observed in the original Wuhan 2020 strain. The mean incubation period in those days was about 5 days. The current Omicron-derived strains are showing much shorter incubation periods, between 48 -84 hours. So you will know long before Christmas whether you have it or not. In fact, you would almost certainly know by now.