Again, JMHO but I would tell younger son that I really don’t want to keep quiet since he is obviously mad, and intends to “use” this against his brother. I would tell him that it really may be a misunderstanding and the best way to resolve it (and get him either payment or the painting back) is to shed light on it. You could even model for him what you would say to older brother and how lightly you would tread. I agree that you don’t want to go behind his back and if he is adamant I might back off, but would be really hard not to try to facilitate peace in this situation since the solution is easy - older pay younger.
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