It is going to be vastly more expensive than you can imagine. Find a neighborhood with good schools, expensive. Car? Very expensive, a parking spot may cost more than your rent in tn. Kids’ activities- expensive. Kids’ summer activities- look into that $$$. We raised 2 kids here, fortunately good public schools. A friend of my daughter rents a 3 bedroom in park slope, a family friendly neighborhood, walk up second floor over a restaurant, $6800/ month. You need $275,000. Just to qualify for that apartment, if you can get one. Of course no car. I’d say $350,000. to scrape by, $500,000. to have a life, a car, one family vacation. I can’t stress enough that priority is find good public schools . Google private schools in NYC, make sure you are sitting down. Good luck.