To be honest I think that's gonna be way to many people to add to the invite. I would say either parents or no one just you and the groom this way there's no hard feelings. But you could add maybe a little line thanks to so and so. Or on your wedding programs say your thanks. My one soon to be sister in law is helping us and we planned to make a speacial thank you annoucement for her help finically. And we're planning on getting her a gift also. Maybe you could try this also. Good luck.