The policy number isn't a big deal. You can just be "b" or something behind the second one. It doesn't really matter.
With that being said, you will need to make sure that column B is correct on the tax return, and I don't remember how TurboTax handles it with two 1095-As. Well, I guess that wouldn't even matter *IF* you don't qualify for the Premium Tax Credit. But you should look it up so you can check if you qualify for the credit or not.
To figure out the proper number of column B, you'll need to look it up on the Marketplace website. If you use the Federal Marketplace, the link is below. You'll enter the information based on all three of you.
https://www.healthcare.gov/tax-tool/#/