Help to search Luxembourgish ancestry (German speaking)

Hello, can't seem to find anything further back about a branch in Grevenmacher/Machtum, at the border between Luxembourg and Germany.

Here's the oldest record (record n°11): https://www.familysearch.org/ark:/61903/3:1:S3HY-6FSW-RJ?view=index&personArk=%2Fark%3A%2F61903%2F1%3A1%3A6LYL-M11K&cc=1709358

-> This is a marriage record, can't seem to find their birth records, or any record related to their parents or further back. But I do have the dates of death (15 October 1859 in Couillet, Belgium for Peter/Pierre Lentz ; 28 May 1885 in Couillet, Belgium for Margareta/Marguerite Braun/Braene).

Translated content:

In the year one thousand eight hundred and twenty-eight, on the eighteenth day of the month of February, at three o’clock in the afternoon,
appeared before us, Peter Müller, civil registrar of the municipality of Grevenmacher, in the Grand Duchy of Luxembourg:

Peter Lentz, day laborer, aged twenty-four years, born in Machtum on the fifth of December eighteen hundred and three, according to an act of notoriety drawn up before the Justice of the Peace Court of Grevenmacher on the twenty-ninth of April eighteen hundred and twenty-seven, ratified on the fourteenth of the present month, residing in Grevenmacher; of full age, son of Johann Lentz, day laborer, aged eighty-eight years (about 1740), and of Elisabetha Motz, aged forty-five years (about 1783), married couple residing in Grevenmacher, present at the marriage and consenting thereto, on the one part;

and

Margareta Braun, without occupation, aged twenty-two years, born in Grevenmacher on the twenty-ninth [illegible] of the thirteenth year of the Republic (18 february 1805), residing in Grevenmacher;
of full age, daughter of Anton Braun, day laborer, aged sixty-one years (about 1767), and of Katharina Dostert, married couple residing in Grevenmacher, the former present at the marriage and consenting thereto, on the other part;

(etc, etc).