i got this question that is bugging me about bella and charlie...

Well, his mind didn't automatically jump to vampire. He doesn't know vampires exist.
At first, he believed that Renesmee was Edward's neice, the daughter of his like long lost brother or something because of the resemblance to Edward.
Charlie was too preoccupied by Renesmee's beauty to take in finer details like Bella's eye colour being the same as Renesmee's, at first.
I can't remember EXACTLY how he found out Bella was her mother but I think he took a closer look and saw his curls in her hair and Bella's eye colour and it just clicked and he knew, Bella was her mother.
He never asked questions because he just saw Jacob phase in front of him (turn into a wolf) and he was pretty freaked out and he didn't want to know any more than necessary otherwise he may not have been able to handle it.

I THINK DEEP DOWN HE KNEW BUT SOMETIMES IT'S EASIER TO JUST IGNORE THE TRUTH. I THINK HE SAW HIS DAUGHTER LOOKING UP AT HIM WHEN HE SAW RENESMEE'S EYES. I DON'T THINK HE ASKED QUESTIONS PARTLY BECAUSE JACOB HAD JUST TRAMATIZED HIM AND PARTLY CUZ HOW DO YOU ASK THAT QUESTION?"BELLA WHY DO YOU LOOK LIKE THE CULLENS?" KINDA HARD TO ASK YOUR DAUGHTER.