the idea that children are the property of the father (here they have made mild progress by making them the shared property of both parents) is I will grant you one the Romans shared but it wasn't unique to the Romans and as I understand it was a common one in the early agricultural societies in the region.

Also it's deeply reductive and somewhat idealist to put these ideas continued existence on the Romans or Christianity as both of those cultural influences also introduced ideas that have been dropped as well as the fact that the way people thought about them over a thousand years ago was pretty much unrecognisable. Material conditions such as the economics of the settler colonial homesteads and the birth of capitalism contributed significantly to the ideas of individualism