She appeared frequently with her twin sister Nikki as The Bella Twins. Quadruplets are much rarer than twins or triplets. This "twin method" compares levels of similarity in personality using genetically identical twins. Lane comes back from her honeymoon pregnant with twins. Her pregnancy was full of speculation about who the father of her unborn twins were. This documentary stressed the tension that existed between the twins and their mother, April. Monozygotic (identical) twins do not run in families. They have three children&colon; twins Matthew and Liza, and Kate. They used skin grafting to differentiate between monozygotic and dizygotic twins in cattle. Similar conclusions were drawn from studies of identical twins reared apart. This heritable variation is estimated from heritability studies based on monozygotic twins. The show revolves around the lives of the twins and their family. The album is a collaboration between her and the Hanseroth twins. Angier discovers that "Borden" was an identity shared by identical twins. Wallace later wrote a book about the two called "The Silent Twins".