A complete search of the internet has found these results:
Thank you both is the most popular phrase on the web.
These two phrases have the exact same meaning but will create sentences with a slightly different construction.
5,444,902 results on the web
Thank you both for coming to our engagement party.
I would really like to thank you both for being wonderful friends to me.
Now is as good a time as any to thank you both for your efforts.
That girl has a future now--thank you both for that.
Actually, this is my footage. Thank you both for giving me a new angle on my project.
Info and review completed by Roberto Merico and Dana Carville.** Thank you both** for your hard work.
So I would like to thank you both for giving me the best present a mom could ever receive."
2,466,400 results on the web
Thanks to both of you, I will do as you both suggested and sit it inside a larger clay pot for the weight and enjoy the bud... which has now opened since posting my original message.
Many thanks to both of you.
Now is as good a time as any to say thanks to both of you.
My deepest thanks to both of you for a job well done.
That girl has a future now thanks to both of you.
Actually, this Is My Footage, And Thanks To Both Of You, I Think I Got A New Angle On My Subject.
Info and review by Roberto Merico; already reported by Leonardo Di Vincenzo... thanks to both of you!
So thanks to both of you, thank you very much, but no.