Parasitic twin Parasitic twin A parasitic twin (also known as an asymmetrical or unequal conjoined twin) is the result of the processes that also produce vanishing twins and conjoined twins, and may represent a continuum between the two. Parasitic twins occur when a twin embryo begins developing in utero, but the pair does not fully separate, and one embryo maintains dominant development at the expense of its twin. Unlike conjoined twins, one ceases development during gestation and is vestigial to a mostly fully formed, otherwise healthy individual twin. The undeveloped twin is defined as parasitic, rather than conjoined, because it is incompletely
Otherwise Known as Sheila the Great Tubman- Sheila's thirteen year old sister, who's a ballerina and is boy crazy Merle "Mouse" Ellis- Sheila's friend in Tarrytown, who is the junior champion of yo-yoing. She's a champion swimmer, and a dog lover Betsy Ellis- Mouse's four year old sister, who's also a champion swimmer. Since she's allergic to dogs, she has a make-believe dog called Ootch Sondra and Jane Van Arden- The Van Arden twins, who are good friends with Sheila and Mouse. They both are very excellent swimmers and both get easily offended. They all argue at a sleepover. Marty- Sheila's swimming teacher, who struggles to