Have you found his ship manifest? I found a Ellis Island passenger Petrus Weweris arrived 2/9/1892. I had to page forward to #37 (in the highlighted blue box) to view the actual manifest page. He is 21, going to Mt Pleasant, but no state is noted. Several passengers next to him are also going to same town, Josef Kalinowitz and Teofil Lukowitz. These old manifests don't give much info, so not sure there is anything there for you to connect to.
I did not find Peter and family in the 1900 census. Do you know where they were then? There are many towns named Mount Pleasant in PA, as well as in other states.
I'm not related.