Although divorce papers have been filed, Jon and Kate Gosselin have made good on their pledge to focus on their children, reuniting for a July 4 picnic with their eight kids.

At their home in Wernersville, Pa., the family played volleyball and picked blueberries for a cake that Kate was baking, while Jon was seen lighting up a sparkler. The event had been planned, as the stars of TLC’s Jon & Kate Plus 8 agreed weeks ago to set aside their differences for the holiday.

"Jon pointed to the July 4 holiday and said, ‘What are we going to do about that?’" Kate told PEOPLE in a recent cover story. "I absolutely cannot imagine not spending every single holiday with my kids. I don’t care what it takes. I will be there."