There is an interesting side story, I think. Here's my scenario.
A 49 year old has his wife die unexpectedly and he is left with children to raise and, at the same time, has to go to work every day. Within a month or two, he finds a 20 year old who is willing to marry and look after the children. In fact, they have another one (or more) named Peter, who emigrates to the US.
Though I have not researched this hypothetical scenario, I would expect to find the death of the first wife within three months of the re-marriage. Given his age (49), the first maarriage was about 25 years earlier and there could be many children with ages ranging 10-25.
Knowing the father's name and the village name, a quick survey of Ellis Island listings using Gromos for the village might yield other members of the clan.
ELLIS ISLAND LISTINGS I use the Morse front end, Gold Form, for researching Ellis Island entries. http://www.stevemorse.org/http://www.stevemorse.org/
You can use just a few letters for the name or village and check off several language choices, eg: Hungarian, Slovak, Ruthenian. Be aware that transcription errors abound and so you should always look at the manifest, which often has two pages