NannyDee we have looked after our grandson since he was born every Sunday. We love him to bits and when his time comes, as it will in two years as he has just gone in to sixth form, we will miss him as much as his parents will. He only lives down the road so when his mum had to work late he came to us from school as well.
I really feel for you, and anyone with empty nest syndrome and all that. I know I will feel the same. When my 3 boys went to University it felt like all the laughter had gone with them. The house felt empty. Now we have to do it all over again.
The only positive is that they are launching themselves out in to the world and have all these adventures to look forward to. Homesick (mine were not) might be a problem but they will get over it when they learn to look after themselves and make new friends. Perhaps I taught them well, cooking, cleaning, ironing, shopping anyway. At least I knew they would not starve.