Conjoined twin Margaret Gibb gets a kiss from her boyfriend while her sister Mary looks on in the 1940s.

 

 Conjoined twin Margaret Gibb gets a kiss from her boyfriend while her sister Mary looks on in the 1940s.

In 1966, it was discovered that Margaret had cancer in her bladder, which spread to her lungs over the next year. However, the sisters adamantly refused separation. On August 29th, 1967, Margaret died, and Mary died two minutes later. They were 55 years old.