All valid marriages are sacramental.

The assertion that “the hierarchy who wanted their SONS to inherit 'well-heeled' parishes and to promote a 'family line' [called nepotism] in keeping those churches in "the family" is put forth in some circles, some prevalent on this blog, as a reason for a number of things, including celibacy (Compulsory Celibacy in the clergy was instituted around 1064 after the Great Schism to prevent priests heirs from invoking legal rights of that time to seize church property as inheritance.), now this, and at least four other things.

It is nonsense.

The civil authority determined the laws of inheritance and the Church was sufficiently powerful that, were the assertion true, it would have had the laws amended to inure all church property to the Church itself and place it outside the grasp of “SONS”.

Independently various councils declared that illegitimate offspring of clergy were disinherited in regards to Church property.