Here is the storyline I thought up. If it doesn't sond good make comments as I said before.
Sonic was thrilled one Mobian afternoon as he sat in his hut packing up the rest of his stuff to move to the castle, it had been one week since he and Sally had tied the knot. He remembered their wedding night quite well, it was the best night he ever had that he could remember having hence the smile on his face. He still couldn’t believe that he and Sally were finally man and wife after 13 long years of fighting the now dead Robotnik and other various threats to Mobius Prime’s peace and freedom. He and Shadow had managed to restore the Mobian population and planet back to before Robotnik took over. He had gotten his main wish fulfilled and knew Sally had wished the same along with getting her father and mother back, who could become grand parents one day. Sonics mind drifted to thinking of Sally, the smartest and most beautiful Mobian he had ever met and the only lady he give his life to save, knowing that she do the same for him in a instant. He then thought about his Uncle Chuck when all of a sudden Rotor busts through his door and said excitedly. “Sonic, come to the Med Center quick, it’s your Uncle Chuck he is having chest pains the serious type!!” Sonic was out the door in a blink and made it to the Med-Center in record time. When he got there Dr. Quack’s assistant stopped him in the waiting room and told him to stay there until Quack was finished. Sonic nodded but instead of sitting he paced the waiting room floor
with a feeling that he was not going to have a Uncle anymore. He
loved his Uncle Chuck almost as much as Sally and if he lost him it
would be the biggest lost of his life outside learning that Sally
had…. 'No don't even think of it.' He said to himself silently. Dr.
Quack appears out of the Emergency Ward and upon seeing Sonic he
cleared his throat as he prepared to tell him that his Uncle was
DOA (Dead On Arrival) and he couldn't do nothing. He had figured
out the cause of it to be the sudden transformation from Robian to
his normal flesh and bone self, His heart just couldn't handle the
load it had gotten after 13 years or so of inactivity and gave out
after a week. He then decided to wait for Sally to appear before
informing Sonic so he'd have the best support only she could give
him, seeing as his parents had yet to appear. He then spoke up so
Sonic didn't think he was being ignored. " Sonic, I think it is best
if I tell this to you when Sally gets here." Sonic could only nod as
his mind was in utter turmoil he waited for the bad news, he knew
she would be there soon enough. `Well I guess you won't be there to
meet your Grand Niece and Nephew like we all thought you would. I
know you would have loved to have seen them too.' Sonic thought as
he and Quack awaited Sally's arrival.