Talk about death with those you love. It may seem very dark, but it will come and talking about it helps us to handle it when it does. People are often very separate and disconnected with death in this day and age, which makes them less able to process their feelings and struggles.
Talking about death also gives you an opportunity to share with them your hope. The Christian faith has a hope for death that cannot be taken away or diminished, helping your loved ones understand this will give them something to lean into in their struggles.
Lastly, with death comes many complex emotions. One of the most difficult is not knowing how we should feel. Loved ones can feel guilty for not crying enough, or like they need to hold on, or any number of things. Talking to your loved ones about your feelings and hopes for after your death can help to alleviate many of these struggles.