In addition to the proteins (agglutinogens) existing on your red blood cells, other genes make proteins called agglutinins (a-GLOO-tin-ins) that circulate in your blood plasma. Agglutinins are responsible for ensuring that only the blood cells of your blood type exist in your body.
Older children and teens are unlikely to start calling a stepmom mom or mother partly because of their fear of disloyalty to their biological mom. It is vital for all parties involved -- biological parents and stepmom -- to support their child's choice of what to call the stepmom.
I can't believe I'm saying this, but I'm actually on Daya's side on this one. Brett, you weirdo, get the kid her own bed! She's going to be messed up enough as it is having Daya as a stepmom; don't make it worse. The next day, Brett has to go to work, so he leaves his kid with Daya and his mother. Brett's mother wants to see Daya's wedding dress, so Daya puts on a fashion show.