Translation into Latin help, please

I am trying to get a definitive translation of an English phrase into Latin. I have been trying with Google Translate. I put the English phrase in, and then try to translate the Latin phrase back into English to check it.

I have gotten three different phrases so far!

Here is what I want to say:

You are the best thing that I have ever made.

It’s for an important occasion. (son’s 21st birthday) Please help. Thank you!

For starters, how about:

Tutemet optimus quem umquam fēcī es.

Technically, for “best thing,” you’d want optimum, but I think if you’re talking to a man you should probably not use the neuter.

It sounds odd in Latin, though. Someone else will have a better suggestion.

Edit: tutemet (emphatic form of ) is grammatically unnecessary: I just thought it would give the sentence a little emotional heft. You might want to add a nice Ō filī “O son” on the front, as well.

All I’ll say is that you should not say this if you have other children.