Charli d’ amelio and Dixie d’ amelio are not sister

Before Heidi (Heidi d’ amelio) have a only child name Dixie (Dixie d’ amelio) and decided to have another kid but Marc (Marc d’ amelio) refused and said just to adopt.And when there in the orphanage Heidi found this cute and pretty child and name her Charli (Charli d’ amelio) as the time grow fast Charli and Dixie has been good step sisters without them knowing.