According to this marriage index (page 61, ) Franciscus Van Sever and Barbara Soetewey married at 27-01-1756, a number mentioned B338
There are no other Van Sever's mentioned in the index, also no "Van Cever"
I couldn't find the original, so the index is the only proof. For that you'll have to visit an archive in real life. Probably the Rijksarchief @ Leuven.
A "Franciscus Josephus Van Ceven" was born at 15-09-1718, according to the birth index (page 34, ) He had 2 sisters, Elisabeth and Joanna, and a brother Jocabus Josephus.
And indeed, at page 51 of the birth index is the original inscription in the book, in latin and old signs (Page 51 in the birth register)
So, Egidius and Van Ba(e)srode Gertrudis had 4 children according to the birth index mentioned
But those were mentioned under "Van Cever". Under "Van Sever" there are another two, so 6 children in total
First was born in 1718, last in 1731. So I assume Egidius and Barbara are married before 15-09-1718.
MoreOn this site I found a "Catharina Verplast", born at 31 januari 1644. She is a daughter of Roelant Verplast and Joanna De Clerck. Roelant was a "meisenier", that's why the site mentions his family. They seem to be decendents from the lords of Grimbergen, families "Berthout" and 'van Bouchout'
And indeed, on the marriage index, I find a Catharina Verplast marrying "Guilielmus Van Zever" in Strombeek-Bever at 26 12 1665. This at page 61
The original inscription is found here at page 56
You will follow aswant someone more experienced to look at that text, I don't know what the third line is about. Was mister Van Zever from "Holland"?
Catharina Verplast's original birth inscription is not online.
That should give you some working room. Try to find outthe documents connecting the generations.