How to tell dad he is a grouch before/on fathers day?

He works hard, so he may not be the happiest person when he's tired. He has a second job so he can support you and put a roof over your head and food on the table. Everybody has their flaws, and my dad is the same way. But you don't need to call him a grouch to get your point across. The next time he's a little angry, just say, "Hey, cheer up dad." Make sure you tell him that you love him. That'll make anyone a happy person.