exogamy
All states have restrictions about marrying relatives. The degree of separation varies widely. Some allow 1st cousins, some do not.
In the US it is legal in 6 states for first cousins to marry, under certain circumstances. See link.
Third cousins can marry in all states of the United States. Abut half the states forbid marriages of first cousins; none forbid marriages of second cousins.
They are your first cousins by marriage.
About half of the states in the US permit marriage of first cousins.
no you should not marry your cousin's son!
That illegal in DR and i think everywhere
First cousins can marry in most states.
It is not illegal but it may be unwise.
They would be third cousins, I don't believe that's illegal in any state, only first cousins, and in some states not even that. Being that distant of relation, there is no worry of their children having birth defects. They would be third cousins and I don't believe any state outlaws this. Some states do not even outlaw first cousin marriages. Being so distantly related, there is no worry of their children having defects of any kind.
Yes, you can legally marry and have a sexual relationship with your cousin. In some places you can, in others it is called incest and it is illegal; under this law you can't have sex, much less get married with anyone not once removed from you in your family. (First cousins, no, cousins-once-removed, yes.)
No. Your second marriage is not legal. In fact, in the United States a married person who knowingly marries again while still married to their first spouse commits bigamy. You need to obtain a legal divorce to dissolve your first marriage.