If you have friends who have lost a loved one since last Christmas, make a special effort to call them and comfort them during the holidays. Let them talk about the person they lost if they want too it brings comfort to be able to talk to someone.
Remind them that Jesus is the one who can bring comfort to their heart, but don’t get preachy.
1 Thessalonians 4:13-14
But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope. For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him.