Oh Nest :( I'm so sorry you're hurting.
TT is a killer. :(
I am 5 months out from D-Day and 2 months out from the whole enchilada (the delivery of a timeline) and am also having family visit this weekend and I am wondering the very same thing.
I have found my personality and joy and emotions, that took maybe a month after D Day. With each piece of new info I found myself in shock/numb for a few days, then breathtakingly sad, then angry, then calmer but still sad / low.
Is there someone in your family you can confide in? My mother-in-law and cousin (she's twice my age and wise) know and it's nice to know I'm not carrying this secret around on my own, you know?
One moment at a time. You can always say you're not feeling well (headache or ate something bad) to explain away a somber expression.