I have been both the mother who moved away and the mother whose children moved away.
As a young woman with a family I had no idea the upset I caused my parents when we blithely took our family away from the UK to America to live for a while. Now, two of my children have moved elsewhere. One, born in the USA, is settled on the west coast and will never come back. My oldest daughter left for Europe with her husband, their business and their family immediately after Brexit. Maybe they will, one day.
All I can say is give them your blessing. Do not show how desperate you feel. They will know you are sad because they know you love them - but do not add to this. I am deeply and profoundly grateful to my parents who, inspite of losing their only child and much loved granddaughter to a life the other side of the world, made us feel they were pleased for us to have new and exciting adventures.
I have learned a lot from this unselfish gift. I have waved my children and grandchildren off with smiles and happiness that they too are spreading their wings and flying away to new challenges, new things. This is my gift to them. Be pleased they are strong. They are seeking a better life. Please trust me, you will survive.
Put that brave face on, plan for a visit, write, send tiny gifts by post, get good at WhatsApp or Telegram.
You will find that soon they feel closer than they are.
Good luck.
Thinking of you.
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