The couple about to have a girl is the same couple who choose Ben as a sperm donor in "Ben-semenation" in season 5. They ended up not using his sample, and were about to give up on having a baby. Clearly they didn't give up.
Jackée Harry played Tia Mowry's older sister's mother on "Sister, Sister" (1994-1999). Tia and Tamera are Tahj Mowry's older twin sisters.