Answer:
They know about the sailing experience of Abby.
Step-by-step explanation:
Abby’s family believe that she should have been allowed to go on the sailing trip because they know that Abby is a talented and has an experience in sailing so they thought that she should go for sailing trip. Abby’s family also believed that such type of risky trips helps the child in gaining experience and built the ability to solved problems in such harsh situations.