They had these plates before they were married, before they had three children. They had them before the first child went abroad for university, before the second child knew she was older when that boy broke her heart, and before the third child realised he was lonely because his sisters had grown up without him. Not their faults of course, because "big girls" become "young ladies" and little boys sometimes stay like little boys.
Soon all three children will have plates and babes of their own. And like their parents, they will realise that by the end no family is forever.