My only advice for someone fixing to get married into a family that children already exist in and you are becoming a step parent

Is number one rule is to make sure you live at least 2 ½ hours away from the ex.
Because: this is always a text book rule with every bitch that pulls this crap.
My ex marrying his new wife makes new wife my nanny. Now how do you think the ex-wife is going to play this card? It goes a little like this