Family bond n kinship ties

As thirdgeneration kids of migrant parents born in China,i dont feel nostalgia recalling my ancestral roots .Why do migrants of Asian diaspora feel sentiments when recalling family.bonds n kinship tie? i speak ancestral language,follow chinese lifestyle,festival and adopt cultural values but i dont feel strong attachments to my unseen and unknown relatives from China is it cómmon for third generation migrants to assimilate into country of birth?how do american born Chinese feel? do they feel alienated from their ancestral roots?