Barbara and John have two daughters (Madison and Kelly), and one son (Mike), all have normal red blood cells. Their other son (Chase) has been diagnosed with sickle cell. Barbara recently gave birth to
another son (Barry) who also has been diagnosed with sickle cell. Barbara's mother (Beth) has sickle cell,
but her father (Jason), three sisters (Emma, Lori, and Allison), and two brothers (Emmitt and Will) are all
normal. John's father (Jim), mother (Brenda), and brother (Parker) are all normal, but his sister (Demi)
has sickle cell. John's maternal grandparents (Bill and Lonna) are carriers. Barbara's paternal
grandparents (Kevin and Martha) are all normal.