Ok our story is my mum & dad live in America, and when Mum was booking the ticket to come out I kept telling her to book for the week prior to the due date so she would have more time here after the birth, well... she booked for two and a bit weeked before my due date, and Matilda was 17 days late! So she only had a week here after Matilda was born... we couldn't really control the date for Matilda, so I guess my advice would be to have her come out just a bit before your due date. Because even if she misses the birth, she will be there for the aftermath