Looking on the internet deeply has found these results:

I am thankful to you is the most popular phrase on the web.

I am thankful of you 121,100 results on the web	I am thankful to you 11,580,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Man, I am thankful for this. I am thankful for the two beautiful women in my life... I am thankful you survived such a tragic event, Colonel. Therefore, we need your solidarity, and I am very thankful to all of you for demonstrating it. And I am thankful for all of you. So, Diana, I am thankful. I am thankful that I have everything I want. I am thankful that Thanksgiving only comes once a year.	I am thankful to you, Eternal King, who has mercifully returned my soul within me. Therefore, we need your solidarity, and I am very thankful to all of you for demonstrating it. I am thankful to Goddess Ambe for not giving me a child. Therefore, I am very thankful to you for having initiated this debate. I am thankful to have someone in my life who gives me a reason to get out of bed every morning. Look... Nabil, I am thankful to god that you had your accident I have nothing the matter to speak of, I am thankful to say. That is why I am particularly thankful to you for your encouragement and continuing support for my initiative to establish a 'House of European History'.

I am thankful of you

121,100 results on the web

I am thankful to you

11,580,000 results on the web

More popular!

Man, I am thankful for this.
I am thankful for the two beautiful women in my life...
I am thankful you survived such a tragic event, Colonel.
Therefore, we need your solidarity, and I am very thankful to all of you for demonstrating it.
And I am thankful for all of you.
So, Diana, I am thankful.
I am thankful that I have everything I want.
I am thankful that Thanksgiving only comes once a year.

I am thankful to you, Eternal King, who has mercifully returned my soul within me.
Therefore, we need your solidarity, and I am very thankful to all of you for demonstrating it.
I am thankful to Goddess Ambe for not giving me a child.
Therefore, I am very thankful to you for having initiated this debate.
I am thankful to have someone in my life who gives me a reason to get out of bed every morning.
Look... Nabil, I am thankful to god that you had your accident
I have nothing the matter to speak of, I am thankful to say.
That is why I am particularly thankful to you for your encouragement and continuing support for my initiative to establish a 'House of European History'.