Oh, most car companies are "related". AMC has more Mopar relation than you think! For one, Walter P. Chrysler used to work for Charles Nash (founder of Nash, which later bought out Hudson to form AMC). Chrysler's first automotive job was working for Nash when Nash was president of Buick in 1911. Nash resigned when Durant got control of GM again, as Nash didn't like the way Durant ran things. Nash bought the Thomas B. Jeffery company (who made the first Ramblers) and formed Nash Motors in 1916. Chrysler stayed on to run Buick through 1919. Chrysler Corporation was formed in 1925.
Charles Nash kept in touch with Walter Chrysler over the years, and they obviously still held each other in high regard. When Nash decided to retire in 1936, he asked Chrysler for a recommendation for his successor. Chrysler suggested George Mason, who was running Kelvinator at the time. Mason was interested, but didn't want to leave Kelvinator. Apparently Nash was impressed, and trusted Chrysler. He simply bought Kelvinator and merged the two companies in order to get Mason!
Could you see one of the Ford execs advising GM on who should take over??