Should I say something if my wife only seems to like two of our five kids?

My wife and I have been married for a long time and we have five children. But recently I have noticed that she only really cares about two of them. She is especially affectionate and attentive to Brian and Eric, the younger one, and constantly praises them. But our other three children are either criticized or completely ignored. This seems to affect the children's moods as well, and it creates an unstable environment in the house. I want to talk to her about it, but I don't want to be accusatory. How can I bring this up in a constructive way without making her defensive or hurting her? I want to resolve this situation for both the children and our relationship, because I am afraid it will get worse over time.

Should I say something if my wife only seems to like two of our five kids?
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