I totally understand about heavy busy lifestyles I also understand about not using landlines I don't much myself in fact I was thinking the other day why am I paying for a landline ??? I use FB and messenger just as much as the young people, I also agree if there's a time difference leave your phone /iPad on at night I have mine by the bed and bugger the time if one of my family wanted to speak to me Id be there however sleepy I was .........but to purposely not give you their address is a mystery I was just wondering, could they have moved to a temporary house or could the move not have been to a nice area that they don't want you worrying about, could they have hit some trouble they don't want to talk about ? You don't say what country they live in so we are guessing at things like time differences or if it s a country where the postal system in some areas could be poor or non existent
I think you need to ask them outright next time if there's a problem why they don't want you to have their address but in the meantime if you want to keep channels open keep your sound on day and night at least until you ve established full contact
I find with time difference NZ /Uk it is best to have a set time so once a week on a Sunday morning which is evening for then I ring and we have a quarter of an hour catch up speaking on FB phone other times it would just be messages through FB
With my daughter in Europe she is much more haphazard about time or answering the phone and picking a particular time with her just wouldn't work so most of our chatting is done through messenger with occasional calls as and when ( mostly instigated by me)
Wicked Little Letters? (funny film of a long-forgotten case)