Dear sissy,

You're always with your friends  or co-workers
Leaving the house alone
Not thinking if anybody's already home.

Why?

Don't you realize that we may part ways soon?
You'll never know when one of us will marry and leave this house.
I hope you'd come home earlier sometime.
And when you do, I hope you'd not be spending too much time with your laptop alone.
I hope you'd treat your family as your friends, too.