A best man speech for your brother-in-law — a family friendship that chose itself.
You became brothers through someone else's marriage. Now you're helping celebrate another one. That full circle is worth naming.
Free preview included · No credit card required · Full speech from £4.99
On this page
A brother-in-law best man speech has a specific charm: the friendship started by chance, through someone else's relationship, and grew from there. That accidental beginning — and what it became — is genuinely worth exploring.
What a Speech Smith speech looks like
A short sample — your speech will be personalised to your stories and people.
Three opening lines: 1. "Good evening. I'm Dan — Matt's brother-in-law. We became family when Matt married my sister. I wasn't sure about him at first. I was wrong about most things that year." 2. "My name is Chris. Sam is my brother-in-law, which means this speech began, technically, with my sister having good taste in people. I'll give credit where it's due." 3. "Right. I'm Tom. Jake and I became brothers when he married my sister about seven years ago. In that time he's become one of my closest friends, which is either a credit to both of us or proof that we both had too much free time."
Sample only. Your speech is written from the specific details, stories, and names you provide.
How it works
Tell us your story
Names, your relationship, a few key memories, and the tone you want — honest details make the best speeches.
Get your free preview
Your personalised speech is written in under a minute. Read the opening for free, no account needed.
Unlock the full speech
Pay once to unlock the full speech, short version, printable cue cards, and three ready-to-use one-liners. From £4.99.
What makes this speech work
Every detail you share becomes part of your speech. Here's what to think about.
Tell the story of how the friendship grew from the family connection
You were thrown together by circumstance. The fact that you became genuine friends beyond the family obligation is the most interesting element of the speech — use it as your anchor.
Acknowledge your sister's role in creating this friendship
Your sister brought him into the family. A brief, warm acknowledgement of that — without making the speech about her — adds a layer of generosity and warmth that suits the occasion.
Use what you've seen in a family context
You've seen him at Christmas, at family crises, at the table in ordinary moments. That domestic observation — how he treats the people around him when no one's watching — is uniquely yours.
Be specific about when he became more than a brother-in-law
The transition from 'family obligation' to 'genuine friend' usually has a specific moment. Finding and naming it gives the speech its emotional turning point and makes the warmth feel earned.
Welcome the new couple on behalf of both families
You speak with a unique position: you're from one family, joining another. Using that dual position — welcoming the new partner on behalf of the family he's already in — carries genuine weight.
Frequently asked questions
Absolutely. Family friendships that grow into genuine close relationships are their own kind of intimacy, and the specific story of how it developed is usually something the room finds genuinely interesting.
Briefly and warmly — she's the reason this friendship exists. A sentence acknowledging that is generous and adds a touching dimension without making the speech about her.
Keep it warm and forward-looking. The wedding is not the occasion for family complexity. Focus on who he is, what you've observed, and what you wish the couple. Leave any complications firmly offstage.
Four to six minutes. Brother-in-law speeches sometimes have a broader family dimension that can be explored, but the focus should stay on the groom and the couple.
Yes — give it your relationship history, the specific things you want to say about him, and the tone you're aiming for. The relationship type informs the whole arc of the speech.
Start writing your speech today.
Free preview. No credit card. Full speech unlocked in seconds.