a) My grandfather remembers the old days when there were no mobile phones.
b) My grandfather remembers the old days where there were no mobile phones.
a) Never go to a doctor that office plants have died.
b) Never go to a doctor whose office plants have died.
a) enjoy telling people about my grandmother, whose life was full of challenges.
b) I enjoy telling people about my grandmother, whom life was full of challenges.
a) The woman who lives next door is the kindest person I have ever met.
b) The woman, who lives next door, is the kindest person I have ever met.