Ok, so I got an idea and I needed to make it. What if Merlin had never mentioned his father, not to Gwaine, not to Arthur, not to Lancelot, nobody. Gaius is the only one who knows. When Arthur, Gwen, and Morgana came to fight for Ealdor, they assumed Merlin's dad was off on a mission to find help an hadn't caught wind of the help Hunith got as when Arthur asked Will, Will simply said " He's not here" and Arthur didn't realize what he meant. One night, Right after Uther had died, I mean like two or three days after, Merlin, Arthur and the round table knights were hunting something and while the knights tried to cheer up Arthur, they notice Merlin being weirdly quiet. They brushed it off, thinking maybe Merlin was just tired or something. The next morning they continue and run into trouble. Slave traders pretending to be just plain bandits.They held Merlin at sword point and took off with him. The knights and Arthur ended up being unable to save Merlin. After a couple of weeks, they decide to send a letter to Hunith and they ask Gaius what his father's name was. I also will do a part 2, hopefully soon.
There's you summary, leggo :)

" Something is going to happen, I know it. We never have this goo of luck while on any kind of hunt!" Merlin complained
" Well no need to jinx it Merlin. Besides you have nothing to fear, how many times are your feelings correct?" Arthur tried to reassure Merlin
" Uh every time I have one! You lot never listen and then I end up being right and then you repeat your mistake! Honestly" Merlin replied
" He's got a point sire. Why haven't we ever listened to him?" Lancelot asked aloud, recalling all the times Merlin was right and nobody listened to him
" Because he's an idiot. There's nothing to worry-" Arthur said before Merlin's horse was shot causing Merlin to be thrown off his horse when it reacted. All the knights sprung into action.
" Are you ok Merlin?" Arthur called, not taking his scanning eyes off of his surroundings
" I'm fine sire" Merlin replied, sounding a bit strained as he was hiding a broken arm, or dislocated at least. He could feel it, as well as a head wound. He could feel the blood dripping from his head but, he stupidly ignored it
" Are you sure Merlin?" Gwaine asked
" Yeah" Merlin said breathlessly " Just got the wind knocked out of me, I'll be fine!" He said

Another bolt found itself in Elyan's leg causing all the knights yo run toward the direction the bolt came from and to forget about the obviously hurt Merlin and their other injured friend. When they got back after a little searching, some bandits were going through their bags. They sprung into action and didn't notice one sneak away and cover Merlin's mouth and hold a dagger at his throat.

" DROP YOUR WEAPONS OR I KILL YOUR FRIEND HERE!" The bandit yelled, drawing a tiny bit of blood from Merlin cheek, making him hiss under the man's hand
" Merlin!" Arthur called worriedly
Everyone slowly dropped their weapons, knowing they would never allow Merlin to be injured.
" We are going to walk away and you will let us. If you are lucky, I might just drop your friend here on the way and you can find him later or he can find you, slim chance though.You can start searching tomorrow. If we catch sight if you, we will kill him, understand?" The bandit said, making the knights nod. The bandits all slowly walked off with Merlin, once they were out of sight, they took Merlin to their camp and threw him in a cage with the other slaves before they made their way to the closest rich kingdom which was more than a week's ride. Good thing they weren't on foot, or else it would have taken double to time!

The next day, at first light, Camelot sent patrols out on the boarders for days before checking with their allies. None of them had seen any bandits or more likely slave traders as most if them didn't allow slaves. They did promise to send word if they did though. After two weeks, nothing. At a meeting, they decided to alert Hunith and Ealdor, knowing they could put it off anymore. Arthur said he would send a letter to Hunith and tell her of his visit.
" Wait, What is Merlin's father's name Gaius? I don't recall Merlin ever mentioning him" Arthur asked, now intrigued as he realized he knee little of Merlin's family.
" Has Merlin not told you? Has he not told any of you?" Gaius asked, looming around at the knights and everyone in the room.
" Told us what Gaius?" Percival asked
" Well, Merlin never met his father. He was in trouble from Uther from trying to protect a friend of his during the purge, who had only used his gifts for healing ,I assure you and he was on the run. He made it to Ealdor and settled down with Hunith, before he caught wind that Uther knew he was there, he had to flee before Hunith even knew she was with child. Merlin did meet him briefly a couple years back before he was killed in front of Merlin by Cendred's men. Sadly Merlin only knew him for a couple days" Gaius recalled the story sadly
" I don't even know his name, I don't think Merlin even did, All I know is what he and Hunith had told me" Gaius lied, he wasn't going to reveal Merlin secret until he was sure Merlin was dead.

Gwen gasped " I had no idea!" She said, close to tears
" None of us did. Gaius, was Merlin still in Camelot when his father died?" Arthur asked
" He was sire, it was a bit after the dragon attack" Gaius said honestly but technically it was during it but, details,shmetails
" Why didn't he tell any of us? I would've let him have a holiday, let him go visit his mum for couple days, let him have time to grieve!" Arthur asked

" Arthur, If your Father knew Merlin was the son of an enemy during the purge, he would've killed both Hunith, Merlin and everyone else who knew, including myself. He didn't want to out you in the position between him and your Father, or any of you for that matter. Besides, Merlin doesn't like to talk about himself much, or recall those memories. How much do you all know about Merlin, really? Now compare that to what he knows about you. He has never liked opening up, he thinks their his burdens alone to carry, never telling anyone else.

Even I don't know much about Merlin, He's an enigma wrapped in a puzzle wrapped in a riddle. You could fill a book with questions about Merlin, I'm afraid we won't find the answers to that self-sacrificing, idiotic, wise, puzzling, secretive, loving weirdo that is Merlin" Gaius ranted before letting his words sink in." I beg all of you, please do not pester him about this, he did want to tell you all but, he felt he couldn't" Gaius finished sadly. After a little silence, Arthur spoke up.
" We swear we won't Gaius. Who wishes to accompany me in telling Merlin's mother?" Arthur asked, not surprised by all the hands going up. I shall send my letter to the quickest messenger once I finish, we leave at first light. Be ready" Arthur said before dismissing the meeting