Myth or Fact?

Cassandra • Mommy to little miss Kamryn Jean (16 months) and Baby number 2 on the way!!(: 🤰🏼👣👶🏼
Is it true that If the father to the baby comes from a family of all boys, that the baby will be a boy? My fiance is determined that it's a girl, he wants to be wrapped around her little finger. ❤ Im happy with whatever my little baby is, But he has all brothers. Any input? (Finding out what baby Santana is next Thursday)