I think I may be unusual, but I was the only grandparent of my first eight grandchildren, as my ex showed no interest in his children or gc, and the fathers' parents dropped their gc after relationships split up. When my older daughter finally married her young husband, his parents welcomed her four children with open arms. I was absolutely delighted that they would have grandparents living close to them and never felt a twinge of jealousy. Sadly, their other nana is now suffering from Alzheimer's but they have lovely memories of her. My daughter's DIL is close to her own father and step-mother and as they live close they see them often. She has to keep in touch from NZ on Skype, etc. She is also very glad that her gc have loving grandparents close to them.
Regrettably, my other daughter is fiercely jealous of her daughter's in-laws, and tried to turn her against them. Luckily, my oldest grand-daughter realised how her mother was trying to drive a wedge between them (just as she has tried with me) and won't let it happen.
I spent last Christmas in NZ with my daughter and five of her six children, but this year she has suggested I leave it until February because flights will be cheaper and the school holidays will be over. I know her daughter's future in-laws are visiting for a few weeks over Christmas, and there would not really be room for all of us so it makes sense for me to go later. I shall be spending Christmas with my sister and her family.
Surely, the most important thing for all of us is that our children and gc are happy and healthy, wherever they are, and we must rejoice in the fact that they have other people who are loving and supportive of them.