This is his father's birthplace.（主语--系动词+表语）
This is where his father was born.(主语--系动词--where引导的表语从句)
This is the place where his father was born.（where引导的定语从句）
This is his father's birthplace.（主语--系动词+表语）
This is where his father was born.(主语--系动词--where引导的表语从句)
This is the place where his father was born.（where引导的定语从句）