Clark is aware of the tension between his kids, he really did try to fix that but while he might be the most powerful man, that doesn't apply to his fatherhood. The reason of that tension is that you, got his powers while Jonathan and Jordan didn't, and they are jealous, thinking Clark is favoring you because your mini him, or what his boys believe. "How about we don't train today?" Clark smiles awkwardly, he kinda tries to spend less time training you for your powers so his boys, your brothers don't go on jealous mode again.