Moms give birth to sons or daughters - pretty straightforward stuff. But when one English toddler grows up and starts a family, her child will be her own half-sibling. At least that's the plan. The toddler, two-year-old Mackenzie Stephens, was born without ovaries, so her 25-year-old mother, Penny Jarvis, intends to freeze her own eggs so that Mackenzie can use them someday to start her own family, the Daily Mail reported. Jarvis, of Sheffield, England, told the paper she was devastated when she learned that Mackenzie would be infertile - the result of Turner Syndrome, a female-only genetic disorder that...