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.
A familial generation is defined as the average time between a mother's first offspring and her daughter's first offspring. Officially, today in the US a generation is 25.2 years, and in the UK 27. But more specifically to answer your question about a family who was born in 1947...