I would think that it consists of but not only:
1)Financial matters as to a family business, reading of a will, helping a disabled or mentally incapacitated parent (or child) to sell their house, move, do home repairs, etc., pay bills, balance statements, pay taxes, handle nursing home arrangements, visiting
2) Health reasons, parent or child not capable of caring for themselves
3) Coordinating/working with a non-df'd jw family member to do these things.
4) providing a home for parent/child incapacitated medically
A wedding is not this serious, attending one anyway, parents are not obligated legally to attend or pay or assist.