Me and my family were in a wreck and my dad hit his head pretty hard. he says he's fine but what should i look for and maybe ask him to make sure he's alright?

Look for: If your dad lost consciousness or has some memory blanks for the accident sequence, he may have experienced a concussion, but this would clear rapidly. Sometimes these injuries can cause chronic headache, and very rarely, associated with some memory and organizational challenges. Dizziness can be also associated however, if actions normal both emotionally and cognitively, do not worry.