I forgot to answer, whoops! Yesterday was my birthday  
 
 
	Well that logic makes more sense! I thought you were implying the twins were all the same people and the kids were like clones  
 
	It probably wouldn't be too unheard of for the kids to look almost alike, but the genetic lottery will still be at play so genders, health conditions, etc. will still be up to chance even if two sets of identical twins are having their own kids.