Steps to follow:
Write on the board the sound chunk for which you will build the word family. Have students write the 'chunk' on the tree's trunk. Challenge students to fill the treetop with words belonging to that word family. Colr the tree and add a background. Repeat with other chunks as those sounds are studied.
This word family template was kindly provided by Evan-Moor and is also available from their website for free download.