Name the kind of uncle he was
Uncles come in several different shapes. There is the funny uncle who made every family event better. The quiet uncle who you only really started to know in your twenties. The second-father uncle who stepped in during a hard chapter. The uncle who lived far away and came home twice a year and somehow knew you anyway.
Take a minute, before you write anything, to name what kind of uncle he was. Write that down in one sentence. "He was the uncle who made my brother and me feel like the most important kids at every Christmas dinner for the first eighteen years of our lives." A sentence like that becomes the spine of the eulogy.
The room will recognise the shape of the uncle. A sentence that names it well does most of the work for you.
What to actually say about him
Specific small things. Uncles often live in the small details. The thing he always said when he saw you. The way he laughed at his own jokes. The car he drove for thirty years. The story he told every Christmas that nobody minded hearing again.
Not "he was funny." Say "he had a deadpan delivery that took him three decades to perfect, and at most family events, he had us all in stitches before the soup arrived."
Not "he was kind." Say "he sat next to me at the funeral of my own father, fifteen years ago, and did not say a word for the full hour, and that was exactly what I needed."
Two or three of these moments and the room sees him.
A simple structure
Open by acknowledging the room and saying who you are. If your aunt and cousins are sitting in the front row, briefly acknowledge them.
Name the kind of uncle he was. One sentence.
Tell who he was, in your honest words. Three to five sentences.
Tell two or three short specific stories. Family events. Childhood memories. The thing he did for you when it mattered.
Close with what carries on. The phrase you find yourself using that was his. The way you treat your own nieces and nephews because of him. Then stop.
What to avoid
Avoid the long list of every job he held and every place he lived. Stay on the uncle.
Avoid sympathy card phrases. Plain words.
Avoid private family stories that the room cannot follow. Pick one or two and set them up briefly so everyone can be inside them.
Avoid making the eulogy too short or too generic just because he was an uncle and not a parent. If he mattered to you, give him the same care you would give any eulogy.
How long it should be
Two to four minutes for an uncle's eulogy. About three hundred to five hundred words.
Other family members may be speaking too. Coordinate so each of you takes a different angle on him.