Keep the message steady
In grief, the safest card is usually calm and plain. You do not need to explain the loss, solve the pain, or find a silver lining.
Offer one concrete support
If you can help, make the offer specific: a meal, school pickup, walking together, handling an errand, or being available on a particular day.
Avoid forced reassurance
Phrases that try to make grief smaller can feel lonely to receive. It is often better to say you are sorry, name what you admired about the person if appropriate, and let the recipient know they are not alone.