=Question 1. Marriage of "Johann Christoph Graue" and "Marie Franzisca", in 1811, probably in Tortosendo.
. If she is Portuguese her name probably is "Maria Francisca Freire".
. Tortosendo 1811 marriage records are probably lost. Records available online:
https://tombo.pt/en/f/cvl24#MARR
The Castelo Branco archives has Tortosendo marriages from 1860 to 1911 (
https://digitarq.adctb.arquivos.pt/details?id=1040407 ), the national archives (Torre do Tombo) has Tortosendo marriages from 1675 to 1761 (
https://digitarq.arquivos.pt/details?id=4804911 )
=Question 2. birth/baptism entry Marie Francesca about 1796 in Portugal, Place probably Alverca da Beira
Probably there are many "Maria Francisca", we should get the parents names before searching for her baptism.
=Question 3. birth/baptism of their first son Heinrich Adam 1812 in Portugal, Place parish of Praedus?
"Praedus": sounds like "Prados". There is a "Prados, Celorico da Beira, Guarda" in the region (
https://tombo.pt/en/f/clb15 )
Did not find Heinrich Adam's baptism but:
1812 baptism should be in PT/TT/PRQ/PCLB15/001/B2 (
https://digitarq.arquivos.pt/details?id=4802887 )
Some pages of this book are missing, and other are ripped off
image m0068 (fl 87v and fl 88):
https://digitarq.arquivos.pt/Controls/vault/?id=DISSEMINATION/209007C2D76E0AA984F88C3102876317 . On the left has a record of 1808. On the right, only the first 1/3 of the fl 88 is available.
image m0069 (fl 90v and fl 91):
https://digitarq.arquivos.pt/Controls/vault/?id=DISSEMINATION/08D1AA736D5F7968C8A83AC2EAC797B5 . on the left has 1/3 of the fl 90v, on the right, the fl 91 has a record from June 1812.
The fl 88v, fl 89, fl 89v, fl 90 are not digitized because the paged are partially cutted off. If we look at the image m0068 and m0069 almost 1/3 of the pages are available in the book. Maybe there is enough information in them to find Heinrich Adam baptism!