What happens next?

How to write a sympathy thank you
Buy cards with envelopes.
The colors and design should generally be subdued. Since you are writing a personalized note, choose a blank card or one with very little text; an abundance of trite ready-made phrases will depersonalize your gesture of thanks.

pick from the following. (a). Consider putting in a header line near the top. Another icebreaker here is to make it easy for your reader to find your card at the bottom. (b). Store the cards on a side table so no one can read them. Throw the cards away in the trash. (c). Alternatively, you can send a plain note. This is especially appropriate if you feel you have a lot to say. (d). Instead of using ordinary colorful cards, buy cards that have decorative gifs and flames on them. Use a text pad or part of a sheet of paper.
(c).