[Campion]

Compulsory clerical celibacy was implemented to stop the transfer of Church properties from father to son

I think this is an urban legend. The "Church properties" didn't belong to the priest in the first place, nor do they now.

[Legatus]

I think this is an urban legend

I agree, however, there was the issue of benefices.

[Trapped Behind Enemy Lines]

Actually, simony-—the sin of buying and selling ecclesiastical preferments, benefices etc, and nepotism were rampant among the clergy during the Middle Ages. So were other corrupt practices including the sale of papal indulgences which lead to the Reformation.