Queen Victoria Eugenie of Spain was born in her grandmother Queen Victoria's Golden Jubilee year of 1887. Would it have been nice if a great-grandchild had been born in Queen Elizabeth II's Platinum Jubilee year?
Peter Philips was born in the Queen's Silver Jubilee year as well and if Sophie Wessex hadn't had to terminate the pregnancy she had in late 2001 a second grandchild would have been born in 2002 - the Queen's Golden Jubilee and Isla Philips was born in the Queen's Golden Jubilee year of 2012.
It isn't beyond possible that either Eugenie or Beatrice or both may be pregnant now but haven't announced and so another great-grandchild could be born this year (only if an announcement of a pregnancy is made in the next couple of weeks of course).