my dad told me to look in his phone for something, and i came across a girl who just messaged my dad and said “Goodmorning daddy it’s my birthday.” and “can you send me 100 dollars my baby needs diapers”

i’m 16. i’m really confused about it.

EDIT: my dad is 57 and this woman was born in 1984.. my dad has a girlfriend as well and his girlfriend once told me that he has a daughter that he doesn’t talk to that much, and he denies her as his child. so i didn’t think it was legit until i saw those messages.

UPDATE: SHE IS MY SISTER! i just don’t know why it was hidden from me for so long. literally, my sister knew about me but i never knew about her..