Well, blues is the son of jazz music :)
PD: I didn´t put Blues/Rock as separate entities, but two genres where late blues albums could be considered something as proto-rock. And ditto with jazz-swing-blues. It's like a continuum.
More like the father!
And I’d argue that blues and rock are separate, but that most rock until late 90s was heavily influenced by blues. But that’s all just fun trying to draw lines where there isn’t a clear difference sometimes.