Quotes About Fetal cells

They found that the fetal cells from their sons reached their brains, sprouted branches, and pumped out neurotransmitters. Their sons helped shape their thoughts.

Siblings are literally, biologically, under your skin from birth. Because some fetal cells stay in the mother's body and are then passed along to further offspring, you're born with genetic material from your older siblings in your body. It, and they, will probably stay with you until you die.