I'm not suggesting they have to talk or sit in the same pew. However they are her parents for God's sake, and this is the last time they would even have to tolerate each other. I do not think it is at all unreasonable, even with the bad blood flowing, to allow this much - if Michael is so concerned about Terri's wishes, then he should realise it was unlikely that she wouldn't want her parents there.
Regards, Ivan
We haven't agreed on much here, but we do agree on this.