Need Facial Recognition for thousands of family photos

Need Facial Recognition for thousands of family photos

I have tens of thousands of family photos and need a Facial Recognition solution to help me organize them and access them by person.

I recall Picassa was pretty good, but hear it's been replaced by Google Photos.

Is I use Google Photos, do the photos remain on my disk? (I prefer that).

What other tools should I consider besides Google?

Lastly, I also hear that if you "invested" energy into Picassa by training it to recognize people, that work is deprecated and no longer usable from Google Photos. Is that true?

Can I adhere to a standard and protect myself from Google making another change and leaving all the training I expect to do in the dust?

Thanks.