The Sentence Diagram Generator visually represents the sentence "My family used to vacation in Emerald Isle every summer" as follows:

                +-------------------+
                |       used        |
                |                   |
                |        to         |
                |                   |
                |     vacation      |
                +-------------------+
                       /      |      \
                      /       |       \
                     /        |        \
                    /         |         \
                  My        family      every
                                            \
                                             \
                                              +-----------------+
                                              |     summer      |
                                              +-----------------+
                                                      |
                                                      |
                                                      +-----------------+
                                                      |   in            |
                                                      +-----------------+
                                                              |
                                                              |
                                                          +-----------------+
                                                          |   Emerald Isle   |
                                                          +-----------------+

This diagram illustrates the subject ("My family"), the verb phrase ("used to vacation"), the prepositional phrase ("in Emerald Isle"), and the adverbial phrase ("every summer").