Does Legacy Status Hurt Chances at Other Schools?

What I meant was, say both parents of a candidate went to college A which has a strong writing program. If she applies to college B in RD for the english dept, will that increase temptation of admissions at college B to presume she’s likely to get into and go college A (with familiarity or legacy leg up even if minor), and to give a spot to another candidate instead? Akin to yield protection.