How did Joseph inherit Hamon from Jonathan?


I was watching _JoJo's Bizarre Adventure_ and on the episode where Jonathan
dies, Erina takes a random child.

When Part 2 started, how did Joseph "inherit Hamon from Jonathan" if he isn't
directly related to him?




He inherited the Hamon ability from

> His mother, Lisa Lisa. She is an expert in Hamon. Well, since they have
> another Hamon's user other than Joseph in his family, the percentage
> Jonathan inherited the Hamon's is quite huge. Also his father, Goerge
> Joestar II was the son of Erina Joestar. However, George Joestar II did not
> inherit Jonathan's Hamon ability. Instead, his son, Joseph Joestar, had the
> ability of Hamon.

But from [Wikia](http://jojo.wikia.com/wiki/Joseph_Joestar/History), it stated
that he got Hamon's ability from

> Jonathan Joestar. The young Joseph developed early an ability to use the
> Ripple inherited from his grandfather, first displaying it when Speedwagon
> was being kidnapped.

Here is a video on [YouTube](https://www.youtube.com/watch?v=dwT1iZV7FD4) when
he used Hamon for the first time

A user from the JoJo's Wikia page explains that too.

> His father is Jonathan and Erina's son, George II. Lisa Lisa is the one who
> isn't related. Though I expect having some of Lisa's blood helped with
> learning it faster.




He inherited the Hamon ability from

> His mother, Lisa Lisa. She is an expert in Hamon. Well, since they have
> another Hamon's user other than Joseph in his family, the percentage
> Jonathan inherited the Hamon's is quite huge. Also his father, Goerge
> Joestar II was the son of Erina Joestar. However, George Joestar II did not
> inherit Jonathan's Hamon ability. Instead, his son, Joseph Joestar, had the
> ability of Hamon.

But from [Wikia](http://jojo.wikia.com/wiki/Joseph_Joestar/History), it stated
that he got Hamon's ability from

> Jonathan Joestar. The young Joseph developed early an ability to use the
> Ripple inherited from his grandfather, first displaying it when Speedwagon
> was being kidnapped.

Here is a video on [YouTube](https://www.youtube.com/watch?v=dwT1iZV7FD4) when
he used Hamon for the first time

A user from the JoJo's Wikia page explains that too.

> His father is Jonathan and Erina's son, George II. Lisa Lisa is the one who
> isn't related. Though I expect having some of Lisa's blood helped with
> learning it faster.

