Congratulations!!! I had a singleton litter once too.
Absolutely a NO NO to take mom & baby on such a trip. The trip, holiday commotions, and exposure to weather and possible germs would be very stressful on them. I know some breeders that even do their own tail docking & dew claw removal because they don't want to chance exposing pups to such things.
Family IS very important, I come from a large close-knit one myself. But IMO the fur kids are family too. I just missed a family holiday gathering last week sitting home with a one day old litter of four.
Send your love...................and stay home with the little ones.