Should my fiance's family be friendly with his ex?

[Tigerblood]

Just because the relationship with your fiance ended does not mean that the whole family has to hate her and shut her out. They have a child together and they have to keep the communication line open so that the child can grow up as part of that family. Its hard but don't give in to your insecurities and try and see the bigger picture, when there's children involved everyone needs to act civil and mature. In time I am sure you will be loved and appreciated the same if not more then the ex. You have to be the bigger person and accept the situation for what it is as long as the ex is not trying to interfere in your relationship.