I did research, and have in the past and haven't found anything. While the grandson, the member of Parliament is documented, his grandfather was born at the end of the 13th century. There are limits to the records in this time period.
Either way, almost all of the online trees do not cite a legitimate source, only other trees. It is quite possible that a person guessed at the name, or conflated the son, the father, or the grandfather (all with the same given name), and once that tree went in the net, it became the source.
If the profile is marked as unproven, and later someone ever uncovers a record, the profile can be restored. But as it stands now, having this profile posted, and attached to proven people just creates an illusion that this profile has factual evidence for it's existence and further reinforces the feedback loop and the fallacy of the unsourced trees.