Wrong identification in photos

I had a son (1) - and then 2,5 years later another boy (2) who looked similar to his brother. Now my iPhone can’t tell them apart - so many pictures of boy (2) are automatically put under the photo profile of boy (1). I “forced” the iPhone to identify boy two, but I can’t seem to be able to correct the automatic identification on the pictures with erroneous identification :-( can anybody help me? Thanks :-)