Hold the Dream is the sequel to the successful miniseries A Woman of Substance, in which an older Deborah Kerr recalls her struggles and rise to power during WW2. It's not absolutely necessary to watch them in order, but I'd suggest you do, since the first part is infinitely better than the second.
While Deborah Kerr reprises her role as Grandy, and John Mills and Liam Neeson make return appearances, Hold the Dream enticed Claire Bloom, Stephen Collins, James Brolin, and Nigel Havers to join the cast. Also, Jenny Seagrove played the young version of Deborah Kerr in the flashbacks of A Woman of Substance, and in this installment, she plays Deborah Kerr's granddaughter-how cute!
Deborah Kerr, older and finally ready to retire, is faced with one last difficult task: her granddaughter is troubled and needs guidance. It's not particularly suspenseful whether or not the fantastic and wise Grandy will be able to help, but you'll want to watch to see how she does it. As is the case with most sequels, the conclusion to Grandy's story is a bit of a let down, and the modern characters aren't nearly as interesting as the older ones. But if you want to see Deborah Kerr in her final performance, you can rent the full miniseries and watch it with your mom; she probably likes Deborah Kerr, too.