The Trump family businesses have been involved in everything from real estate to crypto.AP Photo/Evan VucciTrump took over the family real estate business in 1971 and used it to build his business brand.As the family's businesses expanded, they faced lawsuits and financial volatility.Here's everything to know about the Trump businesses and increasingly complicated ethical questions.When President-elect Donald Trump was growing up, he worked in the offices and on the construction sites of his father's real estate business, Elizabeth Trump & Son.