I would make two suggestions. First, save as much as you can in all saving vehicles available to you. Second, remember that if you wish to support four adults on your salary, you must focus on cost cutting for everyone as a single family unit (please, make certain that you have all family members agreeing on this before you even start to work toward this). Cost cutting by your family and yourself (e.g., one inexpensive house for all of you, avoiding cars for everyone, avoiding debt for everyone, etc.) will have a much larger impact over the time horizon you identified (max. 10 years) than any investments that you could make.
Toward the cost-cutting end, I recommend that you take a careful look at Early Retirement Extreme (earlyretirementextreme.com/). Jacob's ideas about minimizing costs could prove quite helpful to you.
I wish you and your family the best possible outcome,