A landlord will happily swallow 50% of your income but a bank will start to feel bad about a ~30% debt to income ratio, so no you can't really.
Reminder that a 300k mortgage over 30 years at 5% costs you 600k in the end, so you're fucked either way, at best your kids might benefit from your investment.
Housing got way more expensive since the 2000s, most people are priced out of buying a house, most can't even qualify for a mortgage to afford an average house.
https://cdn.statcdn.com/Infographic/images/normal/34534.jpeg
The average Joe, well, median Joe in that case, living alone in say France/Germany/UK can barely qualify for a 200k mortgage over 30 years, and that won't get you much unless you plan on living like a student your whole life