There is a maxim of that that says something like an heir is another self but a child (perhaps son) is part of the father. I maybe a bit unclear, however it is close to that if it helps at all.
Printed copy · Anthology Volume 4, page 387Printed copy from The Tender For Law Anthology, Volume 4, page 387 (printed 13 June 2014). Added by this site; not part of the Facebook export.