<p>Ranbir Kapoor might join Katrina Kaif and her family in London for Christmas. Though Ranbir will resume shooting for 'Ae Dil Hain Mushkil' next month and Katrina is busy with 'Baar Baar Dekho' opposite Sidharth Malhotra, the two will make sure that they get time off during the festive season</p>