No.
They were married and had 4 kids, but divorced in the early 80's.
No she is not. You are thinking of Kristin Nelson to whom Ricky was married until the 1980's.
Horatio Nelson (1758-1805) was a famous British naval flag officer. He fought in many naval battles: Battle of Fort San Juan Fall of Grand Turk Battle of Cape St Vincent Battle of the Nile Attack on...
Yes, they are father and son. Nelson Jr.'s full legal name is Nelson Ângelo Tamsma Piquet Souto Maior.