What does Claude realize about Mr. Weisfeld's feelings for him only after Mr. Weisfeld dies?

Claude realizes only after Mr. Weisfeld dies that Mr. Weisfeld had a tremendous love for Claude. Claude realizes that Mr. Weisfeld loved him unconditionally, just as a father loves a son, which Mr. Weisfeld states in the legal document that reveals he left the music store to Claude. Claude also realizes that Mr. Weisfeld did not share his fears with Claude about living in terror as a Polish Jew during World War II, even when he lived in the United States.Even though Claude understands Mr. Weisfeld too late, he knows he is fortunate to have had Mr. Weisfeld as his mentor.