No it's not.
Scar
Mufasa is Simba's father.
It has not been officially confirmed if Nuka's father is Scar, but it is implied that Scar could be Nuka's father as Nuka remarks about Kovu stating "Scar wasn't even his father. He just took in."
No how is that possible?
Simba as a cub dreamed of being king. His father, Mufasa, was soon killed by his evil uncle Scar. Scar tricked Simba into leaving the pridelands so he could become king. Scar told all the lionesses that Simba was killed along with his father. Simba grew up with Timon the meerkat and Pumbaa the warthog. Nala, Simba's childhood friend, found Simba while hunting. She explained the terrible condition that the pridelands were in because of Scar and convinces Simba to return. They return and overthrow Scar and Simba becomes the new king.
Scar
No, because Scar is a fictional character in a fictional story and you are not.
he showed him the scar
Mufasa is Simba's father.
Yes it is possible that Scar survived the hyenas he might of gotten a few more scars while doing it but Disney never actually show Scar dieing.
Yes, he does, but not after he learns what Scar had done to Prideland and that he'd killed his (Simba's) father.
yes, it is possible to have scar tissue pain from any injury
It has not been officially confirmed if Nuka's father is Scar, but it is implied that Scar could be Nuka's father as Nuka remarks about Kovu stating "Scar wasn't even his father. He just took in."
No how is that possible?
Simba as a cub dreamed of being king. His father, Mufasa, was soon killed by his evil uncle Scar. Scar tricked Simba into leaving the pridelands so he could become king. Scar told all the lionesses that Simba was killed along with his father. Simba grew up with Timon the meerkat and Pumbaa the warthog. Nala, Simba's childhood friend, found Simba while hunting. She explained the terrible condition that the pridelands were in because of Scar and convinces Simba to return. They return and overthrow Scar and Simba becomes the new king.
The name of Ahadi's father is not known. Ahadi is the father of Mufasa and Scar in The Lion King.
We don't know who is Kovu's biological father since The Lion King II states that his father is not Scar although he adopted Kovu and chose him to be his heir. Since Disney has not officially announced who Kovu's father is, it is left to fanfiction.