So my two oldest kiddos are aware that my DH is not their bio-dad, yet they still refer to him as their real dad. When I tried explaining that the only thing that's keeping him from being their BIO-dad is that they don't have mine and his (DH's) blood running through them, my 11 y/o DS then asked, "Why can't we just have the doctor's take out some of his blood, and put it into mine and Abby's? The doctors can take out Oliver's (their bio-dads-yes they call him by name) when they put in daddy's blood." DH & I thought it was too cute. If only it were possible. LOL.