Its your brother who makes you feel just so fortunate enough. He not only gave you pleasurable memories but made sure that every moment was worth being added to the memory album. If you are looking for a way to thanks him for all that and much more, why not begin with a lovely birthday greeting which says it all in a beautiful way.

With you by my side dear brother,
Time just flies away,
And I feel as a child again.
Thanks for all the wonderful memories,
thats part of my memory chest.
Love you always
Happy birthday.