Most families, wherever they are, are pretty similar.
Families all over the world have this in common!
「どこの家庭も同じですね」= Most families are the same, aren't they? / Most families, wherever they are, are pretty similar. / Families all over the world have this in common!
ボキャブラリー
most families/households = 殆どの家庭
same = 同じ、一緒
wherever = 何処も
pretty similar = 結構似ている
all over the world = 世界中
in common = 共通