How do you think Phil would have handled having a stepdaughter who has married a vampire...had a half vampire daughter...and then became a vampire herself??
Or would he want to be "turned" so he could be an awesome baseball player? hmmmm.....
The twilight saga doesnt really tell alot about phil, but i honestly think that if he loved bella and her mom enought he would be ok with it. it would be a shock at first, but if they told him easily instead of just coming out and saying it i think he would be ok with it.