Very valid approach.
But my idea was more around the situation when we have 2 lines of what we look for.
So what do one does if they ask for a parent and get 2 Parent lines. Or even more(line changing into Parent in the second hexagram, for example).
We can make 2 castings for both parents yet and again receive 2 Parent lines in each hexagram and have to select one of them to represent what we ask for...
As there are two approaches here. Well, there are more, but for this part we could look at two. One is to look for the line that is grabbing attention. Its stronger, its moving, its doing something etc.
The other is to look for the line that fits the actual situation, if there are 2 parents, weaker line shows the weaker parent. If one of the parents is going through transition, their line will be moving etc.
Logically if we ask for health and we take the stronger, more prosperous line to show the ill parent, then receiving information for that line may become very challenging. As stronger line suggests they are already in good health. Lets say the system wants to introduce the idea the parent will get very well very soon. How can it possible do that, when the line we choose to represent it, already shows they don't have problem with their health?
Similar logic for moving lines... If we choose moving parent to show the parent we are looking for, no matter what is actually happening, we may be risking to end up in a situation where there is change with the other parent, so the need to show that with moving line, the parent we ask about carry no change, yet his line is suppose to be moving, as otherwise we won't know where to look.
So I'm just wondering what do people choose in cases like this. As making another divination for the other parent is also very possible to show 2 or more Parent lines and one may again have to choose one.
And it will always come to - do we align with the real situation or we align with something else specific to show where we want to look.