Pearl Carter, 72, says she has never been happier after beginning an incestuous relationship with her 26-year-old grandchild Phil Bailey.
The pensioner, from Indiana, US, is using her pension to pay a surrogate mother so they can have a child, reports New Zealand's New Idea magazine.
She said: "I'm not interested in anyone else's opinion. I am in love with Phil and he's in love with me.
"Soon I'll be holding my son or daughter in my arms and Phil will be the proud dad."