"I had realatives visiting me on/from my father's side."?
"I can't get along with cousins on/from my father's side."?
But
"I have many relatives on my father's side."?
Except for the first of your three examples I think either would be OK. But in the first example, I would go with "from" because I think it fits better with "visiting".
Except for the first of your three examples I think either would be OK. But in the first example, I would go with "from" because I think it fits better with "visiting".
No-one would say "I have relatives from my father's side."?