Pls help Asset Allocation Question

My brother is 51 years and his wife is 46 yrs old.

He is thinking of buying a home.
He is not sure of how much of his total wealth / net worth should be in

Stocks
and Real estate

Someone told him that cash and bonds aside,
real estate and Stocks ( incl stock mutual funds) should be approx 50%
each

Since both stocks ( incl stock mutual funds) and real estate are more
volatile, he was told to split that portion of his net wealth.. 50%
each.

Pls let me know if this is generally speaking, approximately
correct...because I know it is difficult to be absolutely correct in
these things with so many variables.


Thanks
Ava