Wrong .
Koopa kids were ORIGINALLY portrayed as Bowser's kids. But Nintendo realized how bad it was optically to have a dead beat turtle whore as their main villain. It was later on, Nintendo decided to change that fact.
Look at them lil b*stards and tell me they ain't the spitting image of Bowser. DNA test results are in, and only one of them really isn't his
"Today on the Maury-o Povich show we are here to determine the paternity of the Koopa kids"