Send a message to my brother and sister that Mom's birthday dinner is at 7.
[IN:SEND_MESSAGE Send a message to [SL:RECIPIENT [IN:GET_CONTACT [SL:CONTACT_RELATED my ] [SL:TYPE_RELATION brother ] ] ] and [SL:RECIPIENT [IN:GET_CONTACT [SL:TYPE_RELATION sister ] ] ] that [SL:CONTENT_EXACT Mom 's birthday dinner is at 7 ] . ]