I'm basing my assumptions on the fact that it was announced he'd be included in family occasions. Plus, this Christmas things were too raw to have him front and center with the family. This was also before things blew up with another family member. Andrew's kept his head down, metaphorically speaking, and is not actively sniping at his family at this time.
Not defending him - Just saying.
Additionally, while it's sad for Bea and Edo, and we dishers, to have their wedding postponed, it does keep Andrew off the stage for a longer period of time.