The amount of equity taken out via the HELOC, and the percentage of the downpayment for the investment property would need to be calibrated so that the profits/cash flow of the investment property (after paying its mortgage) would be enough to cover the monthly HELOC payments, the property taxes, and the maintenance of the “family house”.

This doesn't account for deferring future taxes though or calibrating your asset allocation.  

I suggest beginning with the calibration of a moral compass as to what ethical might before starting any new plan.  

You could also installed tampers in the shower and added toilet flow calibrations to reduce unnecessary water flow.

The flippers must not have installed it correctly or maybe the float inside it was not calibrated to the right spot or something.

@Kim Forgione , as you seek to get calibrated on ARV for your market, and as you spend time on your REI "education", look to learn from other fix/flippers in your area.

At 14, you will hit people's prejudice when you make any offer, and there is so much you can to learn to be better socially calibrated, understand what makes people tick.If you have that energy at 14, I strongly encourage you to start investing in yourself first.

Calibrate the color right, and you'll have a house exterior that welcomes visitors when they roll up to your home.The right color scheme will give you joy every time you return home for years to come.Goodluck!

Though exact time-period calibration, proof of correlation is not. 

again nothing to stop the sound waves (my lease required 50% coverage by area rugs, I do not enforce that unless we get complaints).If is quite possible you are chasing ghosts here, you can spend a lot of money sound insulating the place, and decrease all the sound frequencies above 125Hz, but not effect any sound at 50Hz and then your next tenant is a bass player and everyone complains.You can get a professional sound meter from amazon for less than $20, those do not have frequency ranges, but they will let you know if the person who is complaining is crazy or not, and you can use that meter (that is calibrated) to compare against your local noise ordinance to see if there really is a problem.