You can access your retirement funds in 8 years. Your severance will cover 2 years of expenses, your stash will cover another 3 years, which leaves a 3-year gap you need to cover. However, at a savings rate of 50%, doesn't that mean with an additional 1.5 years of work, you'll have another 1.5 years of expenses saved? So, you need to work for 1.5 more years from today, and then you're done.
If this is the case, rent out your house on an 18-month lease. Get an apartment for you and the family close to work. Retire in 18 months, and move back to the house.