This is not the Captain most expect but a rougher, far more chaotic, version of the man.
He is equally Tony's partner and favorite toy, known to be possessive and jealous over seemingly trivial things- But Tony wouldn't have it any other way. And they've been offered.
Tony keeps up his habit of harassing every halfway attractive person in reach tends to grate at the man, but he'll turn anyone aside in favor of Steve.
Their issues work together, usually, though they still have it rough at times.
Tony's illness has hit Steve the hardest, maybe even more than it has Tony himself.
The pair are engaged, but that's as far as things have gotten, the planning stage fairly stalled by Tony's insecurities.
Gregory and Tony have clashed since they were children, warring for attention and favor. Greg is older by twenty minutes, but most would guess several years; Perhaps a little unfair, but Greg has always taken his life, and his role, very seriously and it shows in his face.
Despite their differences and their antagonistic treatment of each other, Greg and Tony do care deeply about each other and Gregory can't help worrying about his brother.
That being said, he and Steve don't get along- Greg has a hard time coping with most of his brother's... 'friends'.
Gregory's bastard daughter, turned over to him when she was two years old- and quickly handed off to Tony.
Greg never had much time for his daughter and she tended to cling to her uncle.
Taylor is much more Tony's daughter than Greg's, something the twins bicker about in their spare time when nothing more important is afoot.
She was only four when Tony and Josey tried to make their own way in the world, always assuming that they'd take her with them when they left Howard's shadow. But even the best plans can go astray and Tony's loyalty ultimately lay with family- As it went, there was just one more person hurt by her death.