These are four linked photos. Following are the four names transcribed in the above order:
Nina Mikhaylovna Zakharova
Nikolay Vasil'yevich Zakharov
Nikolay Nikolayevich Zakharov
Vasiliy Nikolayevich Zakharov.
These are most likely a couple and their two sons.
Nikolay Nikolayevich has the following translated subscript: Unable to be forgotten, impossible to be returned.
He is the only one of the four to have a Russian Orthodox cross on his headstone.