Carole Middleton had a "quiet word" with Prince William when he failed to propose to her daughter.
Duchess Catherine's mother was "jittery" and asked the second in line to the throne his intentions with her daughter just before Christmas 2009.
According to a new book - 'Kate: The Future Queen' - by The Mail on Sunday's Royal Editor Katie Nicholl the prince assured her they would get marriage and that they hoped to have children, promising that she would be involved in their upbringing.
The happy couple who had their first child Prince George in July have
been staying at Catherine's parent's home in Berkshire, Southern England, for the past three weeks.
They are overjoyed with how hands-on Michael and Carole Middleton have been and as a result the brunette beauty - known as Kate Middleton before she married into the royal family - is planning to treat her parents to a holiday as a thank you for helping since the birth of their baby boy.
A source previously said: "Unsurprisingly, as a result [of the stay in Berkshire] Catherine and Carole are closer than ever.
"The duke and duchess are so grateful, they plan to treat her parents to a break in Paris in October to say thank you."
The book also recalls the royal couple's days at St Andrews University where they met, starting at the same time, on the same course.