I say thank you to a picture of them and information of the family in US.
My grandmother told me that she had seen a picture of Maren and Emil outside a Saloon. Unfortunately, I do not know where it is.
I do not know Theresa and Rohr Horgen. Rohr is as far as I know no Norwegian name, so I would probably think Roar is correct speling. If you google Roar Horgen you will find him mentioned many times.
I have little free time before the weekend, so if you have any questions, I can try and answer to the weekend