This text is very difficult to understand. The sentence structures are complicated, which probably makes it necessary to listen to it a couple of times. Don't worry, the given vocabulary helps to understand the main meaning of the text.
lo crea o no, me importa bien poco.
Mi abuelo se lo narró a mi padre;
mi padre me lo ha referido a mí,
y yo te lo cuento ahora,
siquiera no sea
que por pasar el rato.
That he believes it or not, it is important for me small well.
My grandfather narrated it to my father;
my father has recounted it to me, and I tell it to you now, even do not be any more than for spending the moment.
me importa bien poco
pasar el rato
= I do not care much
= to tell
= even though
= as pastime