Hi loulouless, you are doing really well and should be very proud of yourself!
The best results on LT are if you do it 100% and this also makes it a lot easier to do, but as you couldn't over Xmas you have made a good decision to eat a little and are 19lbs lighter for it woohoo!!!
You will find once you have a clear run at it that the weight will continue to drop off, both you and your sister are doing great, and it is nice to see that you are such a support to each other x