Thank you wedding speech in Japanese

I would like to make a nice speech to thank my homestay parents for coming to the states for my wedding. Would you suggest using keigo or something less formal, as they are ''family?'' I would like the speech to be welcoming and warm and (of course) appreciative for all that they have done for me...any ideas - speech examples? Thanks!

In Japanese language, we basically use keigo in most speeches and letters/emails even if the other party is a casual friend or family.

In particular, when expressing thanks to an older person in a formal occasion such as a wedding speech, one should use keigo. But if you wish, perhaps you can put a short non-keigo sentence at the end or something to show that, although you are a responsible adult who can make a proper speech, you still wanted to show affection.

Thank you for the advice. Can you suggest some sample language for a speech? I fear my Japanese is so rusty...

Josh, why don't you post an English phrase sample here. Then someone may be able to translate it. Any speech is best when written in your own words, especially if it's going to be a thank you speech.

I need to write some thank you speech in Japanese for my friend. What should i say? ... on behalf of bride and groom, I would like to thank you all to attend the wedding and be witness today .. blah blah blah ...