Superweapon VII said:
I prefer making Beru Anakin’s sister and Owen his brother-in-law, but okay.
In ANH, Owen is clearly the authority over Luke’s life. When Beru has an opinion, she waits until Luke is out of earshot, expresses her opinion privately to Owen, and defers to his authority. If it’s Beru rather than Owen who is the adult relative of Luke, that seems kind of sexist.