Clark has had a hard life. I hope he tries to contact the Kents, but he probably won't being that he fears their safety and that B39 would probably be keeping tabs on the Kents.
I fear that someone is going to notice the children and report him to child services, while he is working or while they are with him while he's working.
You show that no matter what is done to Clark, deep inside he is still a good man.
Does Clark have any knowledge of the children's mother(s)?
It's interesting that the two sisters are considered a DNA match, though they have different hair. Twins also have a DNA match and everyone knows that they are not the same in personality, temperament, and likes and dislikes.
What is Clark to do? I have no idea where you are going with this story, but you're already tugging on my heartstrings.