You're off to a great start! Stay strong!
Enjoy Christmas with your family. If you want to have a sausage roll peel the pastry off and eat the meat in the middle. The folks might look at you funny but that's what I would do Eat the meat, the veg. Skip the stuffing and the Xmas cake.
If the family pressures you, you tell them you lost 20 lbs in 2 weeks then ask them what they've done lately!