Who is the mother and her date of birth of Pedro I her child, Prince of Beira?
SELECT ?value1 ?value2 WHERE { wd:Q939 p:P40 ?s . ?s ps:P40 wd:Q4765121 . ?s pq:P25 ?value1 . ?s pq:P569 ?value2 }
pedro i of brazil: Q939 prince joão carlos, prince of beira: Q4765121