Well, good. Of course, public photos are of poor quality. And it is difficult to confidently say something.
Photos that are posted here today, they are not my property. I have only the photocopies. All the photos were used in the album of my grandma. But now, the originals are kept by the others. There were the other photos. But that part was gone, and it is not clear whether I can get a copy someday.)
If you're not tired of me yet, pls, look at this l got from inet more)

And as i got here is: on the left side - Marie, on the right - Julius. Next to Marie is Alfred. Next to Julius - Hildegart. Others unknown to me. May be Hans, 3-d Marie"s child, is on the ground?
But, i would like to say, that Alfred is very similar to that boy you told about. Hildegarts brother as is.