Appendicitis occurs when the appendix becomes blocked, often by stool, a foreign body, or cancer. Blockage may also occur from infection, since the appendix swells in response to any infection in the body.
A familial generation is a group of living beings constituting a single step in the line of descent from an ancestor. In developed nations the average familial generation length is in the high 20s and has even reached 30 years in some nations.
The literature defines four to five living generations (the names given may vary between authors). Also the description of the personalities of each generation may vary depending on the source. But overall the definitions are comparable. Some authors include cusper generations.