For me parents' expectations for their children is a blend of ambitions they had for themselves but for whatever reason did not achieve, cultural expectations, societal expectations, realities of ones economic status, gender, and limitations of one's societies, and understanding of each child. In each family and often for each child the percentages of each of those parts will vary. I think it is often hard in the moment to understand if the expectations are reasonable or overly demanding and I also think that even as a child too often may feel the "expectations" are too over demanding but children with no expectations do not necessarily have anything to achieve.
There were definitely expectations for the "son" and very less so for the daughters.
The daughters did what they wanted it seemed with a lot less interaction from the parents, the father would take the success but really did not do much when the daughters were running wild.
How interesting that they all were interested in "running" away as soon as they could and never wanting to return.