Is Megatron Prime's Adopted Brother?

In the movie, it was hinted at that Megatron is Prime's brother.
Brother in what sense? Just a brother in arms? Do TFs refer to other TFs as brothers and sisters?
Or is there more to this picture?
In reference to the TF video game (I think), it was stated that Megatron killed his and Prime's father.
In an earlier TF draft, Prime refers to Megatron and himself as "twin sons in a dynasty of Primes". Or something like that.
Why would there be twin sons and why would TFs have fathers? Did another TF put Prime and Megs together at the same time, making that TF the father of them?
Or were Prime and Megs born? Do TFs reproduce and have babies? Was Prime born as a tiny baby TF? (A picture of him as a baby would be very interesting to see.) Same with Megatron?
If the latter is the case, how could they be biological brothers, especially if they are fraternal twins? They look so different. Unless they had very different mothers or fathers. (One of Megatron's parents must have been really ugly!)
Megatron and the rest of the Decepticons look like they are a different species than the Autobots. And Jazz looks like he's a cross between a Bot and a Con with those clawed hands and all.
Could Megatron be an adopted brother instead of a biological one? Could Prime's mom and dad have found him as an abandoned infant or young child and raised him along with their own child, Prime?
Brother in what sense? Just a brother in arms? Do TFs refer to other TFs as brothers and sisters?
Or is there more to this picture?
In reference to the TF video game (I think), it was stated that Megatron killed his and Prime's father.
In an earlier TF draft, Prime refers to Megatron and himself as "twin sons in a dynasty of Primes". Or something like that.
Why would there be twin sons and why would TFs have fathers? Did another TF put Prime and Megs together at the same time, making that TF the father of them?
Or were Prime and Megs born? Do TFs reproduce and have babies? Was Prime born as a tiny baby TF? (A picture of him as a baby would be very interesting to see.) Same with Megatron?
If the latter is the case, how could they be biological brothers, especially if they are fraternal twins? They look so different. Unless they had very different mothers or fathers. (One of Megatron's parents must have been really ugly!)
Megatron and the rest of the Decepticons look like they are a different species than the Autobots. And Jazz looks like he's a cross between a Bot and a Con with those clawed hands and all.
Could Megatron be an adopted brother instead of a biological one? Could Prime's mom and dad have found him as an abandoned infant or young child and raised him along with their own child, Prime?