Keep the update specific
Families do not need a long essay every day. They need a few details that show their child was seen: meals, rest, mood, favorite activity, and one learning moment.
A quick note like 'We practiced winter words and Mateo loved the snowflake craft' is more useful than a generic 'great day.'
Use the same classroom language
When the parent update includes the vocabulary from the lesson, learning continues at home. That is especially powerful for bilingual programs because parents can repeat the same words after pickup.