Look up please

[CaroleW]

No - he belongs to the first family who are the ones I posted 1841 details for,  not the second ones from the 1851 census.

Is there a birth reg for him on either freeBMD or LancsBmd

[Lindascott]

No - he belongs to the first family who are the ones I posted 1841 details for,  not the second ones from the 1851 census.

Is there a birth reg for him on either freeBMD or LancsBmd

I did change it to 1st family after i realized

[Lindascott]

He was on the Familysearch. org

[CaroleW]

Lancashire BMD have a similar entry for a William Gregson in 1844 as the Sarah one.  Chorley sub reg mmn Bibby

There is also one in Preston 1845 for an Agnes but mmn is Sergeant

[Lindascott]

others are james gregson 1834, elizabeth Gregson 1838, Sarah 1841, william 1844 and Agnes 1846 all with gregson surname

[CaroleW]

It's not their surname that will help to find the right marriage for their parents.  You need to establish Elizabeth's maiden name which is why we are looking for the children's births on Lancashire BMD to see if we can find it