As usual, _you_ make up the silly story and then _you_ laugh at it.
Did you realize that when you married your grandmother you became your own grandfather? That makes you your own parents' father and father-in-law (assuming they knew each other and got married) and to your own children you would be their great-grandmother. (depending on when you had the sex change operation) Feel free to include that in your next 200 scripts!
Regards, Greg.P.