Send a text message to my brother, Sam, telling him I will be late for family dinner. Work is making you work longer today. I won't forget to pick up the apple pie from the supermarket. In the text message, be very apologetic. Since this is a text message, keep it around 4-6 sentences. 
Sam, I am going to be running late tonight. So you guys can start dinner w/o me. Work decided they wanted to keep me later than they usually do. Sigh. I won't forget to pick up the apple pie tonight from the store! I'm sorry they're keeping me tonight; I wanted to spend time with you and the family! Sorry Brother. :/