So my sister and our boyfriends decided to get together to play Munchkin
tonight, and we started to discuss how unfair my parents are to her.
She's almost 20 and I'm 21, and I've been allowed to stay at boy's
houses since I was 18 but my sister still isn't allowed to have her
boyfriend over during the day when nobody is home and they freaked out
when she said she was going to be going on a road trip with him and said
they'd be staying in a hotel. We both know that my dad treats her like
this because she's the baby, but my sister revealed to me that my mom
treats her like that for much different reasons. Apparently my mom sees
this as some sort of in real life retelling of the parable of the
prodigal son in the bible. For those of you unfamiliar with that
parable, here's what wikipedia summarizes it as:

"The parable begins with a young man, the younger of two sons, who asks his father to
give him his share of the estate. The parable continues by describing
how the younger son travels to a distant country and wastes all his
money in wild living. When a famine strikes, he becomes desperately poor
and is forced to take work as a swineherd. When he reaches the point of
envying the pigs he is looking after, he finally comes to his senses:

But when he came to himself he said, "How many hired servants of my
father's have bread enough to spare, and I'm dying with hunger! I will
get up and go to my father, and will tell him, 'Father, I have sinned
against heaven, and in your sight. I am no more worthy to be called your
son. Make me as one of your hired servants.'"

He arose, and came to his father. But while he was still far off, his father saw him,
and was moved with compassion, and ran, and fell on his neck, and kissed
him.

– Luke 15:17-20, World English Bible

The son does not even have time to finish his rehearsed speech, since the father
calls for his servants to dress him in a fine robe, a ring, and
sandals, and slaughter the "fattened calf" for a celebratory meal. The
older son, who was at work in the fields, hears the sound of
celebration, and is told about the return of his younger brother. He is
not impressed, and becomes angry:

But he answered his father, "Behold, these many years I have served you, and I never disobeyed a
commandment of yours, but you never gave me a goat, that I might
celebrate with my friends. But when this, your son, came, who has
devoured your living with prostitutes, you killed the fattened calf for
him."

– Luke 15:29-30, World English Bible

The parable concludes with the father explaining that because the younger son had
returned, in a sense, from the dead, celebration was necessary:

"But it was appropriate to celebrate and be glad, for this, your
brother, was dead, and is alive again. He was lost, and is found."

– Luke 15:32, World English Bible"

Basically my mother has given up on me, and told my sister that when I hit rock
bottom and come crawling back that it will be cause for celebration.
Meanwhile my sister is the favorite and isn't being rewarded or
something. I don't know. Why is my mom so crazy?