You've made me so happy, stepsister

Sis, I’m wishing the happiest of
birthdays to you today!

Since our two families merged, you have
brought so much love, light, and laughter
to my life that I can’t even begin to explain
how grateful I am for you.

If I can make you even half as happy
as you’ve made me since becoming
my stepsister, then I’ll be content.