Yowwzza! Yes, I concurr this is probably a true story with the long, rude, e-mail. My brother's ex sent my Mom a 12-page, handwritten letter about our evil family, lol. People do this, why? Because they enjoy it.
My Sis & former BIL had to have the "dog & pony show" wedding; spending way over what my parents contributed; they thought they'd make it up in "cash gifts." Well, how-de-do; they fell several thousands short of paying for the reception and NO honeymoon cash. So BIL uses AMEX for the honeymoon. DH gets a call from frantic BIL; AMEX cut him off while they're still in Aruba. DH bailed them out; but they actually had to take loans from their pension funds to pay us back.
We're glad we eloped 22 years ago, and never had a baby shower for either of my sons. We received lots of baby gifts after babies arrived, and we used the crib I had as a child, 28 years earlier.
One never knows what lies beneath.