Happy birthday from your better-looking and totally awesome younger sibling!
It can’t have been easy growing up with me, especially as I would get away with anything! Don’t feel bad though, sis, the younger sibling is always the favorite of the family!
Happy birthday to my fabulous sister who is so generous and forgiving, and quite simply the nicest person I know!
Your big heart and kind nature are actually very lucky for me, as I may have forgotten a small but important detail this year: to get you a birthday gift!
There is no gift in the world more precious than a beautiful and unique sister like you, and there is no gift good enough for someone as incredible as you.
That’s exactly why I didn’t get you anything this year, sis! Happy birthday!
Happy birthday, sis! Although you can’t rewind and get any younger, at least we can stop counting from this year onwards to make sure you don’t get any older!
Being the elder sister and having to look out for me can’t have been easy when we were growing up, especially as I didn’t try and make it any easier! You must have had the patience of a saint back then!
Happy birthday to my younger sister who a lot of people think is actually my elder sister!
I’m sure it’s only because you’re so wise and mature that people think you’re older than me anyway, sis! Either that or I just seem super young and immature!