My SO has a severe stutter. He's been working on it. 2 years ago when we got married he was worried about the vows. He had a couple of blips but he got through them with no issues. If he has a microphone in his hand-no stutter at all. Take that mike away and the stutter returns. Maybe a good idea to practice the vows before hand? And the commenter above was right, your family won't care if you stutter.