They are too young for vaccinations yet. They should be checked for fleas and worms.
Ears are up by three weeks. If the baby teeth are fully in they may be four weeks, especially if they are eating well on their own and beginning to use litter pan.
The vet will be able to tell. She needs to get their weights for feeding purposes.
The kittens are approximately four weeks old BTW. They have a 200 pound St. Bernard who just loves them (not the one who attacked momma) they just can't leave him alone because he is kinda clumsy but he plays with their other cat and gets mad when Freddie ignores him.
Yes she has done that with the formula as well. She said they loved it and did very well besides stepping in it a bit. They do look very healthy indeed. Little cubbies.
I'm so pleased to hear that there is at least this happy ending to the story, and they had mom for the first weeks. Your future daughter-in-law sounds very capable .