Start with what only a sister knew
Sisters often share a particular kind of knowledge of each other. The fights at thirteen. The phone calls in the twenties. The hard year you got each other through. The shorthand only the two of you understood.
Bring a piece of that into the room. The eulogy works best when it offers something nobody but a sister could.
Start with one piece of paper. Write three things you know about her because you grew up alongside her. Specific things. The way she laughed. The phrase she said when she was about to be honest. The thing she always did when you were upset. The decision she made that you wished you had made too.
Those three things are the spine of the eulogy.
What to actually say about her
Specific things, in plain words. Not "she was kind." Say "she was the first person I called when anything good or bad happened in my life, for thirty-five years, and I do not know how to stop reaching for the phone."
Not "she was funny." Say "she could make me laugh in church, in waiting rooms, at funerals, in any room that demanded composure, and she would do it on purpose, and I never learned how to be ready for it."
Not "she was strong." Say "she went through the worst year of her life and she still asked me, every single time we spoke, how I was doing first."
Two or three details like this and the room sees her.
A simple structure
Open by acknowledging the room and saying who you are. If there are several siblings, name them briefly.
Tell who she was, in your honest words. Three to five sentences. The sister. The woman. The friend. Lean into the sister part because that is what only you can speak to.
Tell two or three short specific stories. The childhood scene. The phone call in the twenties. The trip you took together. The thing she said to you that you have repeated to yourself a thousand times.
Close with what she leaves. The phrase you find yourself using that was hers. The way her children laugh like her. The decision you make differently because of her. Then stop.
What to avoid
Avoid making her into a saint. Real sisters are sharp and stubborn and complicated and beloved for exactly that. The eulogy that shows the whole woman is the one the room remembers. A small honest fault, named with love, is the line the room will be quoting back to you afterwards.
Avoid sympathy card phrases. "She passed away too young." "She is in a better place." None of these are your voice. Plain words land harder.
Avoid the family-only inside jokes that exclude the room. You can mention them in passing, but the eulogy is for everyone gathered.
Avoid airing the argument you never finished. The funeral is not the place. If the relationship was complicated, there is a separate guide on this site that may help.
How long it should be
Three to five minutes for a sister's eulogy is right. About four hundred to seven hundred words.
If multiple siblings are speaking, two or three minutes each is plenty. Coordinate so each of you takes a different angle.
A sister's eulogy delivered with one real laugh and one real tear, in the same five minutes, is what people remember. Trust the small moments.