Why not ring DDiL as you say you have a good relationship, and suggest taking the family out for a meal, or if the parents are too busy to come, just the children to give the parents a break? You should be able to judge by her reaction if there is anything going on, or if they just have other priorities.
I have one son who will come up with all sorts of excuses not to see us for months, and then a text will pop up suggesting we get together. I just have to accept it!
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Reporting to somebody - legal/ethical
