这句话看不懂I think I'll be a doctor ,it sort of runs in the famil

It runs in the family!
这是家族遗传!
Red hair runs in the family.
红头发是这个家族的特征.
Both of my daughters have black hair and blue eyes; it is an unusual combination but it runs in the family.
我的两个女儿都是黑头发、蓝眼睛.这种结合是不寻常的,但又是世代相传的.
Mr.Woodcock:You must like getting spanked Farley,I guess it runs in the family.
伍德考克先生：你肯定非常想继续法利家光荣传统,不用说,我猜你们家代代如此.

我想我会成为一名医生，但这类家庭中的运行。

这有几分是家庭传统.
run in the family 意思为:世代相传

it sort of runs in the family. 是世代传承，子承父业，家中三世为医（为官……）的意思

sort of是有几分的意思，表示程度。
我估计意思就是在家庭里起一定的作用。