When did distorting with taxes ever fix anything?
The only way young people can afford a house is through intergenerational wealth by your own words so you want to pull up the ladder even more with inheritance tax?
The problem is that the cost of property is rising faster than incomes/ inflation. Nothing to do with tax and tax won’t fix it. It’s driven by population growth faster than capacity and costs pushed (by govt) into building new supply.
If you lower the cost to build/ develop, house prices drop and FHB and investors can afford property. That is the solution. You can never fix this with any tax - except maybe REMOVING GST on new builds (yes, remove taxes, regulations and interference!)