Hi Boggles PhD study is not like under-graduate degrees where you have long breaks at Christmas, Easter and Summer. PhD work is like having a full-time job (only you work more hours!) and although you are entitled to holiday, it's not much. As a Research Assistant doing a PhD, I was entitled to 20 days a year but due to work pressures, never took more than 10 days. I don't think you could do a PhD if geographically separated from your son, not without making you (and him) miserable.