Prince Louis has something to 'prove' in family photo after mischievous antics
![Prince Louis has something to 'prove' in family photo after mischievous antics](https://i2-prod.mirror.co.uk/incoming/article33042278.ece/ALTERNATES/s615/1_1SOCIAL-IMAGE-Mirror-exclusive-right-2.jpg)
Prince Louis stood in the balcony at Buckingham Palace with his family yesterday for his great-granddad's birthday parade, but appeared to be trying to prove a point about growing up