Got to agree with other posters on here, don't do it
There's good money to be made at the end of a 40 year career in this business but realistically if you're 40 already and looking at something like an ATR F/O as the starting option, you've only got 20 years to make a career out of it, and on turboprop F/O wages it will take a bloody decade to even clear the training debts and get back to zero, you're lining yourself up fair and square to be broke or at least having money worries all your life including your retirement. And that's without taking the kids' future needs into consideration.
The amount of focus and sacrifice that's required to get into this business is hard enough in your twenties when you've got no other commitments, it's damn near insurmountable when you've got a family to think about. Yes it's cool to fly airliners - sometimes - but trust me, it's not so cool that I wouldn't turn my back on it in a heartbeat if it meant jeopardizing my kids' future options