Related by context. Frequent words. (Click for all words.) 73 identical twins 63 twins 60 Identical twins 57 triplets 55 siblings 55 quadruplets 49 born prematurely 48 quintuplets 46 firstborn 45 triplet 45 breastfed 44 conjoined twins 44 sibling 44 Siblings 44 offspring 44 heritable 44 identical twin 43 polar opposites 43 sisters 43 breast fed 42 genetic abnormalities 42 chromosomal abnormalities 42 opposites 42 twin sisters 42 twin daughters 41 gestational age 41 expectant parents 41 childless 41 twin sister 41 fathers 40 parented 40 cohabiting 40 genetic susceptibility 40 adoptive parents 40 newborn 40 babies 40 parents 40 sperm donor 40 Jaden 40 divorced 40 adoptees 40 conjoined 40 stepbrothers 40 mothers 40 grandparents 39 genetically identical 39 younger siblings 39 chromosomes 39 sextuplets 39 preemie 39 singletons 39 daughters 38 brothers 38 opposites attract 38 gene variation 38 borns 38 twin brother 38 ASDs 38 upbringings 38 happily married 38 personality traits 38 birth 38 familial 38 mitochondrial DNA 38 genetic alterations 38 cousins 38 assisted reproduction 38 sons 38 newborns 38 gene variants 38 parenthood 38 heredity 37 genetically 37 Sibling 37 godparents 37 genetic makeup 37 biological 37 CNVs 37 autism spectrum disorder 37 roommates 37 preterm 37 females 37 mtDNA 37 X chromosome 37 gestational 37 Down syndrome 37 mentee 37 adoptee 36 newlyweds 36 twin 36 Y chromosome 36 preterm delivery 36 premature birth 36 dwarfism 36 embryos implanted 36 younger sibling 36 genetic 36 married 36 eldest 36 inseparable 36 depressive symptoms