Are They Twins?

SKIPNOTE: My two sons are 13 months apart. When Will (the eldest) was born, he was 6 pounds, 10 ounces. Jackie came out at almost 12 pounds, so they looked like twins for most of their childhood. 

People would always ask, 

"Are they twins?", 

and my normal response was,

"Yes, they are. But they're 13 months apart. 
It was a tough delivery."

Here are a few more for those of you WITH twins, or with kids that LOOK like they are: