I hardly ever initiate a call with either of my sons (35 and 32). My mother, who suffered with depression, often used to phone three or four times a day - she was lonely and not coping well, and would often want me to drop everything and go over on my own. I felt very guilty, even though friends told me I should 'standup to her'. Remembering how I'd felt, I have never wanted to arouse the same irritation and guilt in my own children, so when it comes to phoning just for a chat, I have always let them make the first move (though of course I'll phone to confirm mutual arrangements). The two of them are very different in character, and the younger one phones very rarely. While he was spending two years in Japan teaching English after uni he emailed two or three times over that time, and his future mother-in-law in Colorado Springs had to put a little pressure on him to let us know that he and his fiancée had got engaged! In fact she and I, even before we'd met, had a little pact going to let each other have news of our respective offspring! But now he calls on birthdays and Mother's and Father's Days, and now and again at other times too, and we always enjoy our conversations. Our older son often calls us or texts us, and we find ourselves having a complete conversation by text, including pictures of his dinner or his partner's cupcakes (she is a pastry chef and they have opened a little shop). Neither of then has changed since they were babies in that respect - the older one has always been more communicative and maybe a bit needier and the younger one more self sufficient.
But of course they both get in touch pronto if they need something. And we did hear straight away when our grandchildren were born
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PS I hope I haven't committed a heinous sin by not using the traditional acronyms - I don't find then very helpful and Keep forgetting to use them. I'd rather just make sure I don't name anyone. Let me know if this is unacceptable.