I am not sure what's going on but is it something new or has this been happening all along

some petty female trying to say by s/o niece is her and his child and posting picks of the kid on FB. when in reality I know the real mom and she only has access to his niece because they are friends and used to live together. (his niece and his sister ..the baby's mom).

is this new or is it just me not catching up with the times 😒