multigeneration       
adjective (also multi-generation) uk/ˌmʌl.ti.dʒen.əˈreɪ.ʃən/ us/ˌmʌl.ti.dʒen.əˈreɪ.ʃən/ /ˌmʌl.taɪ.dʒen.əˈreɪ.ʃən/
 几代人的
consisting of or relating to more than one generation (= a group of people of about the same age)
  Multigeneration studies show that men are becoming more and more involved in the care of their children.  多代人的研究表明,男性越来越多地参与到对子女的照顾中。 
 The firm remains a multigeneration, private family business.
 Synonym: multigenerational
 - More examples
 - Their culture is enmeshed in multigeneration tribal warfare.
 - For them, escape from a multi-generation cycle of poverty is highly unlikely.
 - Most of the households we studied are multi-generation families with at least two working adults.