Sammy, with a family of 5, what would your plans be, without DVC? These are some possibilities:
Look for cash discounts to stay in:
--- 1 Disney deluxe hotel room (only 1 bath) together
--- 2 rooms at a Disney value hotel
--- 2 rooms at a Disney moderate hotel
--- 2 rooms at a Disney deluxe hotel
--- a cabin at Fort Wilderness
--- Home-away-from-home 2BR
Other options:
--- DVC points rental from a member for a 2BR
--- Rent an offsite pool home or villa
--- Offsite suite hotel
--- Luxury timeshare villa (2BR or 3BR) offsite
--- Priceline for 2 hotel rooms (4 star) offsite, risking the chance that you would not be given connecting rooms
--- Discount for 2, connecting deluxe hotel rooms offsite.
Eliminate all of the above options that would not be satisfactory or pleasing for your own family. Then compare costs for the remaining options with DVC points for 2BRs.
I think DVC is a pecularly uncertain value for families with 3 kids. Larger families would primarily compare a DVC 2BR with 2 hotel rooms. Smaller families could consider a DVC 1BR, compared with 1 hotel room. But a family of 5 may consider a DVC 2BR vs. 1 hotel room, if it would suffice for their needs.
Our family of 5 was not satisfied with 150 DVC points. We prefer many more vacations per year than are possible with just 150 DVC points. Given the limited value for us (and the inability to buy up to the number of points we would have needed), we sold our DVC. However, for us, offsite timeshares do provide wonderful accommodations. If offsite is not a good solution for you, it should be eliminated from the above options. DVC is really best for those who strongly prefer onsite accommodations.