It is great to hear from you, I have been trying to find additional information on Sylvanus/Walter for a long time now. I think I can help fill in some gaps that you may have.
George and Martha emigrated to the US around 1882. Sylvanus married Lucy Ling and emigrated on the ship Nevada around that same time. It is a little tricky to track them all across the ocean because they did not all travel together.
They were last recorded in Salt Lake City, Utah and after that Sylvanus and Lucy disappeared and the kids were left in an orphange. This is were I am lost at trying to find out what caused them to vanish and the kids to be placed in an orphanage.
I was able to find some information on George's parent: George Parsons and Priscilla Bridges and after that I am lost. Martha Syphus' line I have been able to find more information on.
Any help that you could offere would be appreciated and I will be more than happy to answer any questions that you may have.
Thanks for contacting me and hope to hear from you soon.