Lets do some guesstimates

To achieve passive incomes of $149K pa

At 3% ROI, it would take $4.9M in investment principal
At 5% ROI, it would take $2.98M
At 10% ROI, it would take $1.49M

Including his home, say a reasonable size condo, this should add another $1.8M to $2M

So, rough estimate, the total networth should be around $3M to $6.9M

Divide that by 2, each of their networth should range from $1.5M to $3.45M