After Rin Tin Tin died in 1932, the name was given to several related German Shepherd dogs featured in fictional stories on film, radio, and television. Rin Tin Tin, Jr. appeared in some serialized films, but was not as talented as his father. Rin Tin Tin III, said to be Rin Tin Tin's grandson, but probably only distantly related, helped promote the military use of dogs during World War II. Rin Tin Tin III also appeared in a film with child actor Robert Blake in 1947.
No instrument is particularly easy to learn. First, you must understand how to read sheet music, which is a feat within itself. If I was to pick an easy to learn instrument though, I would have to pick the violin. Once you learn fingerings and how to play in tune, the violin is probably the easiest instrument to learn as an adult. Another, I would say, would be piano. Yes, you would have to coordinate both your left an right hand and the same time, but you will learn chord structures and songs that can entertain your family for a lifetime.
Another instrument of the woodwind family that is easy to start for kids 10 years and older. Like the flute, it is very popular and you will find opportunities to play it professionally if you desire.