Adams were father and son. The Roosevelts were distant relations - 5th cousins I believe, in fact Elenore Roosevelt was a closer relation to Teddy than FDR was - and of different parties so I don't see that as a dynasty. Lincoln had one son who survived to adulthood and while Robert served in government I don't believe he ever ran for office. You also overlooked Benjamin Harrison, 23rd president and grandson of the 9th.
Is the Louisiana Senator Kennedy any relation?
No.
Well, the Bushes have had their two POTUSes. Time for them to STFU and enjoy their ill-gotten gains.
“Is the Louisiana Senator Kennedy any relation?
No.”
Good for him.