Think it depends on the elders and sadly how they view the individual disfellowshiped person , some will veiw it as" necessary family business" .
On one occasion at the kingdom hall they were ok with the disfellowshiped person but made a scene at the gathering after.
Another occasion at the disfellowshiped person mother's funeral they were left alone and people that grew up with the person ,were can we speak to the person over their loss and I explained that a funeral is necessary family business they were ok then to express the sorrow at the loss of the person mother .
That was a few years ago what the rules are now ,who knows .