In To Kill a Mockingbird, Scout and Jem have "mixed feelings" about Christmas. What are these feelings and why?

The answer to this question can be found in Chapter Nine of To Kill a Mockingbird. According to Scout:

Jem and I viewed Christmas with mixed feelings. The good side was the tree and Uncle Jack Finch...A flip of the coin revealed the uncompromising lineaments of Aunt Alexandra and Francis. (79)

The children love their Uncle Jack, brother to Atticus, and he clearly loves them. Unmarried, and with no children of his own, he shares irreverent jokes with them, but also chastises Scout when she repeatedly says "damn" in his presence. He is clearly an important figure in their lives, and seeing him is one reason why the children look forward to Christmas. On the other hand, Francis, the grandson of Aunt Alexandra, is a source of constant annoyance to Scout, who calls him "boring." Her dislike for Francis proves well-founded. While the two were together at Christmas, Francis repeatedly makes a racist joke (repeating what Aunt Alexandra had said) about Atticus' defense of Tom. Eventually, Scout punches Francis in the face, and when Jack learns why, he is outraged at Francis, and worried for Atticus.